单项选择题

What is the first step in kinematic analysis？

A．determine the respective velocities of the bodies
B．velocity analysis
C．all the required displacement variables are determined
D．acceleration analysis

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How many people at least must there be in a room, such that the probability that someone has the same birthday as you do is not smaller than ?

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《刑法》规定非法种植（）株以上罂粟够成犯罪。

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