对于同一方向的相同车道内,如果在不同断面同时进行维修作业,若断面的间距在()(m)以内,可以作为同一个作业控制区来进行布置。
A.1000
B.1500
C.2000
参考答案:A
At the railway station, the mother waved goodbye to her daughter until the train was__________.[ ]
A. out of sight
B. out of reach
C. out of order
D. out of place
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