主要运输巷上下山的上下车场必须设有与绞车()的声光信号装置。
A.闭锁
B.联动
C.对打
D.联系
参考答案:B
People celebrate Chinese New Year ________ from house to house. [ ]
A. by go
B. in the way go
C. by going
D. on the way to go
若离心泵轴承箱只在泵体一端,则称为()。