题目内容

组成平面高副两构件的接触必须为_____。

A. 点接触
B. 线接触
C. 点或线接触
D. 面接触

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使两个构件直接接触并能产生相对运动的联接称为运动副。（）

A. 对
B. 错

When we meet a person for the first time we say: _____.

A. Pleased
B. Nice to meet you
C. Enchanted

If someone says "Thank you", you say: "You're _____."

A. welcome
B. well
C. nothing

When you want to get someone's attention you can say: _____.

A. Excuse me
B. Stop
C. Sorry