The waiter hardly has a day off, ? [ ]
A. hasn't he
B. doesn't he
C. will he
D. does he
D
下列仪器中,不能作为反应容器的是( )
A.试管
B.集气瓶
C.量筒
D.烧杯
属于“岗位专职制”内容的是()。
A.包机制
B.保管定人
C.设备定号
D.管理定户