基坑开挖施工中,底部标高的允许偏差为()mm。
A.50
B.10
C.20
D.5
参考答案:B
Miss Gao isn’t here. She _____ to the bus station to meet Mr. Brown.
A.go
B.has gone
C.has been
D.would go
巡视检查配电设备时,不准越过遮栏或围墙。