在水平巷道或倾斜巷道内，电缆悬挂点的间距不得超过（）米。
A.3
B.4
C.5
参考答案：B
You ________ your son to watch TV for too long hours! See, Mr. Morrison called that he didn’t finish his homework yesterday.
A．are always permitting
B．have permitted
C．permit
D．permitted
无缝线路地段大修作业时，作业前应调直钢轨，不允许在1ｍ范围内出现（）以上的原始不平顺。
