根据压缩机润滑油管理规定，应（）个月化验一次油质。
A.l
B.3
C.6
D.12
参考答案：B
Many teachers were praised at the meeting,Mr.Zhou ___________. [ ]
A.including
B.being included
C.to be included
D.included
简述空盒气压计、空盒气压表的测压原理。
