Mnlc digital currency

1. A. For proposition 1, m n may be a straight line of different planes, so it is wrong; For proposition 3, there may also be n & 8834; α Therefore, it is wrong; So choose a

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3. [answer]: C [analysis]: when the L line becomes the P line, the scope of the commercial area may become larger, the residential area not only becomes larger, but also the rent rises, and the instrial area becomes smaller.