在同一构件上，任意两点的绝对加速度间的关系式中不包含哥氏加速度。( Y )?xml:namespace>?xml:namespace>?xml:namespace>
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2．作平面运动的三个构件之间共有三个速度瞬心，它们不一定位于同一直线上。
A. 对
B. 错
站台服务包括进出闸机服务、乘客问询服务、帮助重点乘客服务等。（）
A. 对
B. 错
-Are you doing anything special on Friday, Bill?-_______-Oh, what a pity!
A. No, nothing special
B. Yes, I have promised to call on some friends
C. Yes, of course
D. No, I’m not sure. Why?
-I’d like to make an appointment with Mr. White.-_______
A. Sorry, he is busy at the moment.
B. Why didn’t you call earlier?
Certainly. May I know your name?
D. Sorry. He doesn’t want to see you.
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