判断题

判断题：（）1、球笼式万向节和球叉式万向节都是不等速万向节。
正确
错误

答案：错误

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单项选择题

丙烯酰胺属（）毒类，本品具神经毒害作用。

A、剧
B、高等
C、中等
D、低

单项选择题

In Review step, if you find you have difficulty recalling important information of a part, what would you do?

A．Read that part quickly again.
B． Skip it and go on to the next part.
C． Repeat Question, Read, and Recite steps.
D．Ask your teachers for help.