题目内容

自行车后轮轴属于()。

A. 心轴
B. 转轴
C. 传动轴
D. 曲轴

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某三相异步电动机的额定频率为50Hz，额定转速为980转/分，则此电动机的磁极数为()。

A. 不能确定
B. 6
C. 3
D. 3.06

Complete the sentence with one of three words .They climbed over the mountain ______.

A. safe
B. safely
C. safety

Kim felt _______ when he finished the project.

A. tiredness
B. tiredly
C. tired

My mother cooks___________.

A. decent
B. decently
C. decency