往复式压缩机的运动部件主要包括（）、（）、（）。
参考答案：曲轴、连杆、十字头
The person sitting opposite _____ Mr．Smith is our new manager．
A．to
B．/
C．with
D．of
“He hasn’t got any hobbies— ________ you call playing games on computer a hobby.” Mr.Lin said.
A．If
B．Unless
C．When
D．Since
