活塞式空压机的主要零件有机座、气缸、曲轴连杆部件和气阀部件
A.对
B.错
参考答案：A
I guess Tom won’t keep on asking me the time from now on, as he has had ______.
A．his watch repaired
B．his watch repairing
C．repaired his watch
D．repair his watch
修理后的转子绕组要用钢丝箍扎紧，扎好钢丝箍部分的直径必须比转子铁芯直径小（）mm。
A、2
B、3
C、3～5
D、6
