检测比空气重的可燃气体或有毒气体的检测器,其安装高度应距地平面(或接板)()m。
A.0.3~0.6
B.0.7~0.9
C.1~1.3
D.任意
参考答案:A
— We need a room for tonight, and I’d like to take a chance to check in without reservation.
— Don’t you know about the jammed hotels in this season? ______.
A.Better play it safe
B.Do as you please
C.No problem
D.Think nothing of it
指导润滑工作正确进行的基础资料有()。
A、润滑图表
B、润滑卡片
C、机械换油计划
D、润滑计划