调整轨道、整修、更换和补充防爬设备、整治线路爬行,锁定线路、道岔。属于()的作业范围。
A.大修作业
B.经常保养
C.综合维修
D.临时补修
参考答案:C
—Someone is knocking at the door. Is it Ann?
—It _____ be her. She is giving a performance at the theatre now.
A.may
B.must
C.can’t
D.mustn’t
在正线、到发线上调车作业应遵守哪些规定?