A .50mm
B .75mm
C .150mm
D .240mm
[单选题]回流线距隧道壁的最小安全距离是:()。A .50mmB .75mmC .150mmD .240mm
[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
[单选题]架空地线距隧道壁的最小极限距离是:()。A .50mmB .75mmC .150mmD .240mm
[单选题]回流线距桥梁的最小安全距离是:()。A .50mmB .75mmC .150mmD .240mm
[单选题]回流线距接地体的最小安全距离是:()。A .50mmB .75mmC .150mmD .240mm
[单选题]保护线距隧道壁的最小安全距离是:()。A .50mmB .75mmC .150mmD .240mm
[单选题]架空地线距隧道壁的最小安全距离是:()。A .50mmB .75mmC .150mmD .240mm
[单选题]保护线距桥梁的最小极限距离是:()。A .50mmB .75mmC .150mmD .240mm