不宜采用球磨机粉碎的药物是（）
A.沉香
B.硫酸铜
C.松香
D.蟾酥
E.五倍子
参考答案：A
There're _____ fish in the pond (池塘). They're very lovely. [ ]
A. a little
B. little
C. few of
D. a lot
为防止机组飞逸，灯泡贯流式机组在控制环的右侧（面向下游）设有关闭重锤
