题目内容

动车组车轮踏面多数采用锥形踏面。

A. 对
B. 错

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What criteria are there to determine the origin?

What methods are there to determine substantial transformation?

Please elaborate advantages and disadvantages of the different methods mentioned in the passage.

激励的本质就是识别和满足人的需求。

A. 对
B. 错