消防移动泡沫炮炮座回转节应定期检查和更换(),保持炮体转动灵活。
A.润滑油脂
B.机油
C.汽油
D.菜籽油
参考答案:A
I regret to say your performance didn’t reach the relevant requirements, ______you cannot be accepted by the company.
A.in a word
B.in other words
C.after all
D.on the other hand
矸石不超过巷道断面的1/3,使用耙矸机出矸的耙矸机到工作面的距离不超过()
A.20
B.30
C.40