机床工作台不准堆放()等物,注意刀具和工件的距离,防止发生撞击事故。
A、工件
B、工具
C、量具
D、油壶
参考答案:A, B, C, D
一堆沙重480吨,用5辆载重相同的汽车运3次,完成了运输任务的25%,余下的沙由9辆同样的汽车来运,还需几次可以运完( )
A.4次
B.5次
C.6次
D.7次
There are so many kinds of MP3 in the shop. We can’t decide ________. [ ]
A. what to buy
B. to buy what
C. which to buy
D. to buy which