1. But I didn't work in the center and I didn't live in the center, so I couldn't give any good advice. Personally, there should be a certain difference between going to the confinement center and being a sister-in-law: working in the confinement center is actually quite happy. With so many pregnant women. I can feel that they like their children<
first of all, although Yuesao is also a nominal employee of an intermediary, she is more like a freelancer (I don't know if it's accurate, but I can't find a better word at the moment). She arranges her own work and of course accepts the supervision of the employer, but relatively speaking, she should be free, just taking good care of the children and the puerpera. And the confinement center, is to obey the confinement of the confinement center, at the same time to accept the al supervision of the confinement center and customers
secondly, the salary of Yuesao is relatively higher, but she can't enjoy some of the company's benefits. However, the employer may give Yuesao some benefits, which is hard to say. In the case of a child care center, it's equivalent to being an employee of the company every month. As for wages and benefits, they are different
in the end, Yuesao is the one who has finished the work. She doesn't know where the next one is, what kind of service and what kind of person she is going to serve. She doesn't know whether it's difficult to do anything and has to deal with it by herself. If you go to the same place to work every day, although the people who serve you are all kinds of people, you will be supported by the center anyway, won't you?
2. Route 1: from the North long-distance passenger station (Luoyang Longmen Hotel Tongli bus company) to the West long-distance passenger station, take route 69 and go down about 14.41 km
line 2: from the North long-distance passenger station, take route 39 (railway station - all ages), transfer to route 30 at Henan Museum and go down (the last three nongnongnong Lu - Zhongyuan Lu of West Ring Road) to the West long-distance passenger station. About 13.72 km
line: go down from No. 32 (Huayuan road Liuzhuang railway station) of the long-distance passenger transport north station, transfer to No. 30 Agricultural Road (the last three agricultural roads Zhongyuan Road in West Ring) and arrive at the long-distance passenger transport west station. About 13.57 km
Route 4: start from the North long-distance passenger station, take No.9 Jingguang Road, transfer to No.99 Zhongyuan Road, go down (railway station (north ring automobile decoration Square Longhai Road West Ring Road) station Yuantong Textile City), and arrive at the West long-distance passenger station. About 14.13km,
line has reached
3. Bus line: No.15, about 6.3km
1. Walk about 60m from Lishui railway station to high-speed railway station
2. Take No.15, pass 11 stops, and reach the second hospital station
3. Walk about 330m to Lishui second people's hospital
4. It is suggested not to buy Haier's home appliances. Now Haier manufacturers are not responsible as before. Not only the quality is not good, but now the services are outsourced, so the service providers make their own money. It's sad!. My family bought Haier's air conditioner, washing machine and refrigerator. The air conditioner has been repaired five times in three years (four times because of quality, one time because of unqualified installation, but I still paid for the repair, because the warranty period was just over when I found the problem). The washing machine has been repaired once (because the installation was not in place). The refrigerator just had a problem, saying that the solenoid valve was broken. At least I won't believe in Haier any more (the quality is too low. Fortunately, I bought other brands of TV, or I would have to repair them). What a big bullshit brand.
5. Liu Yanping of Wenchang middle school in Hainan Province is the opening chapter of senior high school biology textbook and the basis of senior high school biology knowledge. Cell division is one of the key contents in the chapter of cell, which is reflected in the examination questions in the college entrance examination every year. Because the process of mitosis is complex, students are easy to confuse the characteristics of each stage of mitosis, which leads to confusion of thinking and loss of marks in the examination. There were some knowledge points about mitosis in the college entrance examination: 1) cell cycle; ② The similarities and differences of mitosis process in animal and plant cells; ③ The characteristics of nuclear structural changes ring mitosis; ④ The change of chromosome number ring mitosis; ⑤ The significance of mitosis. The following is a brief introction of each stage of mitosis, hoping to help students understand the knowledge. 1、 Mitosis is the main way of cell division in eukaryotes. For the convenience of research, the division period is artificially divided into four periods, namely, early stage, middle stage, late stage and late stage. The following takes plant cells as an example to briefly introce the changes and characteristics of cells in each period. Interphase: it is characterized by the completion of DNA synthesis, replication, and RNA and protein synthesis, providing material preparation for cells in division phase. At the same time, the cells grew moderately. Mitosis (M phase): prophase: chromatin condenses to form a certain number of chromosomes (disordered and scattered in the center of the spindle) which can be seen under the microscope and have a specific structure. Each chromosome is composed of two sister chromatids, connected by a common centromere. Characteristics: two disappeared and one formed, i.e. nucleolus graally decreased (dispersed in cytoplasm) and nuclear membrane graally disappeared; The two poles of the cells emit spindles, forming a spindle shaped quadrate pituitary gland. Metaphase: under the traction of the spindle, all chromosomes are arranged in the center of the quadrate pituitary gland, and their centromeres are located on a plane in the center of the cell, namely the equatorial plate. At this time, the chromosomes are orderly arranged on the equatorial plate, with stable morphology, clear number and easy to observe under the microscope. Anaphase: sister chromatids disappear and become two independent chromosomes at the two poles of the cell. That is, each centromere divides into two sister chromatids, which become two daughter chromosomes, doubling the number of chromosomes. Under the traction of the spindle, the daughter chromosome moves to the two poles of the cell. At this time, the chromosomes are evenly distributed to the two poles of the cell, and each pole has a set of chromosomes with exactly the same shape and number. Telophase: the chromosome stretches and becomes chromatin. Characteristics: two forms and one disappears, that is, the nuclear membrane re forms, the nucleolus also begins to appear, and the nucleus returns to the interphase morphology; The spindles graally disappeared. A cell plate appeared in the equatorial plate. The cell plate expanded from the center of the cell to the periphery and graally formed a new cell wall. At this time, a plant cell divides into two daughter cells. 2、 The difference between animal cells and plant cells in mitosis animal cells have a pair of centrosomes composed of centrioles. At interphase, the centriole doubled and became two groups. In the mitotic phase, the centrioles of the two groups moved to the cell poles. At the same time, numerous radial stellar rays were emitted around the two groups of centrioles, and the stellar rays between the two groups of centrioles formed spindles. At the end of animal cell division, there is no cell plate, but the cell membrane is sunken from the center of the cell, and finally the cell overflows into two parts, each part has a nucleus. In this way, one cell divides into two cells. The microtubules of plant cell and animal cell spindles originate from the two poles and emit spindles to form spindles. Star rays are emitted around the centrioles to form spindles. The way of cytoplasmic division forms cell plates and cell walls The characteristics of mitosis are: (1) the interphase chromosomes replicate once; (2) the chromosomes replicated ring mitosis are evenly distributed to two daughter cells; (3) the chromosomes in parent-child cells remain constant; (4) the dynamic changes of chromosome number and DNA content; (4) the chromosomes 2n2n2n4n4n2ndna0 ～ 4n4n4n2n chromatid 0 ～ 4n4n4n004 at prophase metaphase anaphase anaphase The characteristics of animal cell mitosis different from plant cell mitosis are: (1) the disappearance of nuclear membrane and nucleolus; (2) the formation of spindle; (3) the stellar rays around the centriole; (3) centromere division and chromatid separation, Not only the master of the main characteristics of the whole process of cell mitosis, but also the master of the difference between animal and plant cell mitosis. During the prophase of mitosis, two centrosomes in animal cells move to the two poles of the cell respectively. The centrosome emits star rays and forms a spindle between the two centrosomes. In plant cell mitosis, spindles are proced from the two poles to form spindles. This is the main difference between animal and plant cells in mitosis. Option C is correct. (2) at the beginning of mitosis, if the chromosome number is n and the DNA content is Q, The chromosome number and DNA content in each cell after mitosis are respectively:
a n and 0 C N / 2 and Q / 2
b n and Q / 2 D n / 2 and Q analysis: the dynamic changes of chromosome number and DNA molecular content ring mitosis are investigated. The changes of chromosome number are as follows: 2, 2, 4, 2, The number of DNA molecules changed in the order of 4, 4, 4 and 2. The number of chromosomes did not change and the DNA content doubled in prophase. Therefore, the chromosomes in the daughter cells formed by cell division are the same as those in prophase, and the DNA content is half of that in prophase. (3) the following statements about cell cycle are correct: (1) mature germ cells enter the next cell cycle immediately after they are proced; (2) all somatic cells in the body are in the cell cycle; (3) cells will stay in the division phase by inhibiting the synthesis of DNA; (3) interphase provides material basis for cell division The scope of application and its changing process. Cell cycle has a certain scope of application, only the continuous division of cells have cell cycle, divided into interphase and mitotic phase. Interphase is the preparation period of the whole cell cycle, which mainly carries out the replication of DNA molecules and the synthesis of related proteins, providing the material basis for the division phase. If DNA synthesis is inhibited, the cells will stay in interphase. The mature germ cells are proced by meiosis, which is haploid. After they are proced, there is no longer cell division. Only after the sperm and egg combine to form a diploid, can cell division take place. In the process of cell mitosis in higher plants, the following organelles are directly involved in the activities: A. Golgi apparatus and ribosome B. Golgi apparatus and centrosome C. chloroplast and ribosome D. centrosome, Golgi apparatus and ribosome analysis: Golgi apparatus is related to cell mitosis and forms cell wall at the end of cell mitosis, Golgi should take part in activities; In the process of mitosis, there is protein synthesis, so ribosome is involved. Centrosomes in lower plants are related to the formation of spindles, while in higher plants there are no centrosomes. The higher animal cells have centrosomes. The following figure shows the mitotic diagram of a plant cell with six chromosomes. According to the analysis of the graph, answer: ① what is the period of division shown in the graph B______ The reason for judgment is u u u u u u u u u u u u. ② In a cell, the number of DNA molecules is the same as that of chromosomes. ③ Doubling of chromosome number occurs in___________ Fig. In the process of division, a series of morphological changes and activities of chromosomes are closely related to each other______ It's compatible. The activity of chromosomes depends on_________ The role of the government. Analysis: this question not only examines the ability of map recognition, but also examines the law of chromosome changes in the process of mitosis. Therefore, grasping the characteristics of each period is the key to solve the problem. First of all, according to the characteristics of chromosome changes in the figure, we can determine that each period and its change order is: B is prophase, a is metaphase, D is anaphase, C is telophase. Then we can answer the question according to the figure. Answer: (1) the prochromosome contains chromatids, which are scattered in the center of the spindle. (2) C, D, D chromosomes and DNA are evenly distributed in the two daughter cells. Spindle traction error: if we do not master the characteristics of each mitotic stage well, we will make mistakes in judging the four graphs, and do not master the changes of chromosomes and chromatids in the four graphs, It is also easy to misjudge each period. (6) in the mitotic phase of onion root tip mitosis, the different stages of the number of DNA molecules and chromosomes in each cell are a. prophase and metaphase B. metaphase and anaphase C. metaphase and telophase D. anaphase and telophase analysis: the dynamic changes of DNA and chromosomes in the mitotic phase are: DNA, chromatin replication (interphase) one chromosome contains two chromatids, The relationship between two DNA molecules (metaphase) chromosomes and DNA is 1 ∶ 2. Answer: a wrong cause: this question examines the changes of DNA and chromosome in each mitotic phase. Students are required to understand the relationship between DNA and the number of chromosomes, that is, one chromosome contains chromatids, on which there are two DNA molecules; It does not contain chromatids and has a DNA molecule on it. (7) the following figure shows the change of DNA content in nucleus ring cell mitosis: Analysis: the change of DNA content ring cell mitosis: DNA replication occurs ring interphase, so the DNA content in interphase is doubled; The DNA content remained unchanged in the early, middle and late stages; Two daughter cells are formed at the terminal stage. Because the chromosomes are evenly distributed to the two daughter cells, DNA is equally distributed to the two daughter cells along with the chromosomes, so that the DNA content in each daughter cell nucleus is the same as that in the cell before DNA replication. In the process of mitosis, the process of DNA replication is longer, so the increase of DNA content in the figure is a process of graally doubling the original. Therefore, the expression pattern of DNA curve should be graally upward; The decrease of DNA content is e to the formation of two daughter cells bounded by the formation of nuclear membrane. Once the nuclear membrane is formed, the DNA content is halved, so the curve of DNA content in the figure is vertical downward. Answer: a wrong cause: the key to solve this problem is to master the changes of DNA content in each mitotic stage. We should understand the biological meaning of the curve in the figure, that is, the DNA content increases and decreases exponentially. 8. (2000) 32. The chromosome number of an animal is 24. The number of DNA molecules and chromosomes of a cell in the prophase of mitosis in this animal is () a.12, 48b.24, 48c.24, 24d.48 and 24 respectively. In interphase replication, the number of DNA molecules in prophase has doubled, which is twice the number of chromosomes. However, the centromere of prophase chromosomes has not been separated, and the number of chromosomes has not changed, which is the same as that of somatic cells. Option D is correct. 5、 Suggestions for preparation: from the college entrance examination over the years, we can know that the content of cell division is not very difficult, and the scores are not many. Most of the questions appear in multiple-choice questions, and most of the questions are scored by subtraction
6. S
n为自然数列{n}的前n项和，所以S
n=
，
∵
为数列{a
n}的调和平均值，
∴H
n为数列{S
n}的调和平均值，H
n=
=
=
=
=
，
∴
=
=
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故答案为：
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7. You mean the Russian tube 2 of the former Soviet Union П two П Right? It's a filament with a central tap
1-pin, 7-pin power supply, voltage 2.4 V; 1. 7-pin parallel, 5-pin power supply with filament center, voltage 1.2V.
