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