My empty island of the world

2. Some of them have PVP mines, some of them are novice mines, and some of them can do tasks without PVP mines

3.

1. Stone PICK: as iron ore needs at least stone pick to dig (DIAMOND ORE needs iron pick), so more stone pick should be prepared when going down the mine. If there are only wooden pickaxes at the beginning, it is recommended to carry a workbench with you, so that you can synthesize stone pickaxes after digging round stones

Torch: torch is composed of coal mine and stick. In the beginning, no coal mining partner could get coal by burning logs in a furnace

3. Food: players in peace mode don't take it. Players in difficult mode, if they don't want to be scared by zombies, Xiao and coolie who jump out every minute, bring some food. It's enough to bring some wheat in the early stage

4. Water: in case of magma excavation, it can be immediately watered out to ensure survival

Other: furnace, worktable, furnace can melt iron ingot and other ores, iron ingot can make pickaxe; The worktable can make us better survive in the underground, and even place a small home in the mine

How can a novice mine without getting lost:

1. First, dig a 2x2 square, with Steve (you) facing the torch

The next torches are all inserted on the left side (or on the right side), and then the main mine is excavated to dig out the three square blocks in front (that is, the three square blocks circled by yellow triangle in the figure)

4. There is a plug-in called different stone brushing machine, which can brush out minerals in the stone brushing machine

5. In the early stage, you can build a stone brush and pay attention to the saplings. In the expansion of the island, you can remember to leave a grass cube. You can also add some entertaining mods, such as the nose of the village name. In the middle stage, if you have more stones, you can build a brush tower or add some

6. 1. Brush ore? Unless you use server bugs (it seems that version 1.7.2 has been released, and there are bugs available)
2. Is there a villager? If so, it is recommended to plant a large number of sugarcane
brush the ore quickly
3. Is there a mole? If so, I don't have to say anything more

7. The butt joint of two steel plates with the same thickness is made of Q235-A steel. The known weld length is 100 mm and the plate thickness is 8 mm[ σˊ t] How much tensile force can the weld bear

by formula σ＝ F/L δ 1≤[ σˊ t] F = L δ 1[ σˊ t]
it is known that l = 100 mm = 10 cm δ 1 =8mm=0.8cm σˊ T = 167mpa = 1670kgf / cm2
then: F = 10 × zero point eight × 1670 = 13360kgf
A: the maximum tensile force of the weld is 13360kg.

8. Tensile force of butt weld σ= F/L δ Shear stress of butt weld q = f / L δ Lap weld tension Τ= F/1.4KL
welding stress refers to the stress caused by welding. The internal stress proced in the welding process and the shape and size changes of the weldment caused by the welding heat process. The non-uniform temperature field in the welding process and the local plastic deformation and microstructure with different specific volume caused by it are the fundamental causes of welding stress and deformation. When the non-uniform temperature field caused by welding has not disappeared, this kind of stress and deformation in the weldment is called transient welding stress and deformation; The stress and deformation after the disappearance of welding temperature field are called resial welding stress and deformation. Under the condition of no external force, the welding stress is balanced inside the weldment. Welding stress and deformation will affect the function and appearance of weldment under certain conditions, so it must be considered in design and manufacture.