制作钢丝绳套，其插接长度应不小于钢丝绳直径的15倍，且不得小于（）。
A.100mm
B.200mm
C.300mm
D.400mm
参考答案：C
切换27.5KV压互时间控制在（）之内
A.1S
B.2S
C.3S
Now that Martin was aroused in such matters, he swiftly noted the difference between the baggy knees of the trousers worn by the working class and the straight line from knee to foot of those worn by the men above the working class.
