电机车的插锁连接器在拔开过程中隔爆结合面的有效结合长度小于（）mm，即为失爆。
A、20
B、25
C、30
参考答案：B
在直线建筑接近限界中，距线路中心1400ｍ以内，高度不超过钢轨顶面（）。
My brother suggested he and I be taken to an amusement park this weekend, and we were glad to know that our busy parents did not ___ to the plan.
A．object
B．refer
C．listen
D．agree
