题目内容

扭杆弹簧可提高车辆抗侧滚性能。

A. 对
B. 错

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动车组车轮踏面多数采用锥形踏面。

A. 对
B. 错

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.