泵坑内电缆跑电时，必须采取（）防护措施。
参考答案：绝缘
The young man is _____ going back to his home-town after graduation.[ ]
A. hoping to
B. looking forward to
C. deciding to
D. refusing to
重约1N的物体可能是[ ]
A、一张作业纸
B、100cm3的水
C、一个大西瓜
D、一头牛
