在速度小于120km/h区段,瞭望条件大于()m以上时,钢轨探伤小车、轨道检查小车作业,邻线来车可不下道。
A. 1000
B. 1200
C. 1500
D. 2000
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A.focusedB.paidC.givenD.laid
A. focused
B. paid
C. given
D. laid
A.so thatB.in order toC.whichD.that
A. so that
B. in order to
C. which
D. that
A.distinguishB.preventC.judgeD.differ
A. distinguish
B. prevent
C. judge
D. differ
多组捣固机械同时捣固时,前后距离应不小于()m,走行应保持同步。
A. 1
B. 2
C. 3
D. 4