本线来车时的下道距离Vmax≤60km/h时,不小于()。
A.500m
B.800m
C.1400m
D.2000m
参考答案:A
How I wish we could study _________ there are fewer exams!
A.which
B.that
C.when
D.where
钢轨绝缘接头的最小轨缝,不得小于6mm。