[问答题] 什么是极限档距及允许档距?
[单选题]保护线距桥梁的最小极限距离是:()。A .50mmB .75mmC .150mmD .240mm
[单选题]保护线距接地体的最小极限距离是:()。A .50mmB .75mmC .150mmD .240mm
[单选题]保护线距隧道壁的最小极限距离是:()。A .50mmB .75mmC .150mmD .240mm
[问答题] 什么是纵测线?非纵测线?偏移距?道间距?
[单选题]回流线距桥梁的最小极限距离是:()。A .50mmB .75mmC .150mmD .240mm
[单选题]回流线距隧道壁的最小极限距离是:()。A .50mmB .75mmC .150mmD .240mm
[单选题]回流线距接地体的最小极限距离是:()。A .50mmB .75mmC .150mmD .240mm