如果风机的叶轮未找动平衡，运行时容易发生（）
A.振动和噪音
B.轴承发热
C.电机过载
D.流量不足
参考答案：A
— _____________________________
— It's Monday.[ ]
A. What's the date today?
B. What day is it today?
C. When do you go to school?
可用于牙弓非缺隙侧的卡环是
A．杆形卡环B．回力卡环C．联合卡环D．对半卡环E．圆形卡环
