You look _____ now. You'd better go to bed. [ ]
A. slept
B. asleep
C. sleepy
D. sleeping
答案:C
下面不属于工艺基准的是()。
A.设计基准
B.工序基准
C.定位基准
D.测量基准
在同样的烟速条件下,缩短振打周期可提高了除尘器的效率。