在球磨机运行中，禁止在（）下部清除煤粉和钢球。
A.传动装置
B.传动装置和滚筒
C.滚筒
D.球磨机
参考答案：B
Her husband had ___ a large business during his lifetime.
A．built up
B．checked out
C．picked out
D．gone through
急性化脓性阑尾炎术后，7天拆线，切口无红肿、无渗液、无压痛，记录为（）
A.Ⅱ甲
B.Ⅱ乙
C.Ⅲ甲
D.Ⅲ乙
E.以上均不是
