吊拖时拖缆的俯角一般应低于:().
A.10°
B.15°
C.20°
D.25°
参考答案:B
My brother hurt his ______ yesterday. He can’t walk now.
A.arms
B.legs
C.hands
D.ears
《铁路营业线施工安全》中对电力在铁路营业线施工的规定之一()利用特快旅客列车与前行列车的间隔进行施工。
A.可以
B.应该
C.禁止
D.视情况