洞内导线边长在直线地段不宜短于( );曲线地段不宜短于( )。A.150m,50mB.200m,500mC.200m,70mD.250m,70m
洞内导线边长在直线地段不宜短于( );曲线地段不宜短于( )。
A.150m,50m
B.200m,500m
C.200m,70m
D.250m,70m
相关考题:
导线点应尽量沿路线中线布设,洞内导线边长在直线地段不宜短于( );曲线地段不宜短于( )。A.150m,50m B.200m,500mC.200m,70m D.250m,70m