向空罐注人介质时,流速不宜过快,以免冲击力太大损坏浮子,当液面达到()m以后,液面趋于平稳时方可按正常速度操作.
A.2
B.3
C.1
D.4
参考答案:C
— What’s the matter with you?
— After the long walk, my legs _______ and I couldn’t even take one more step.
A.gave out
B.wore out
C.ran out
D.tired out
当客人已到楼层服务台时发现开重房或开错房时怎么办?