()的目的是防止电气设备外壳带电而危及人身安全。
参考答案:接地
一日三餐中,需要能量和油脂最高的是[ ]
A.早餐
B.午餐
C.晚餐
D.夜间加餐
The number of pandas(熊猫) becoming .
A. is more and more
B. are less and less
C. is smaller and smaller
D. are fewer and fewer