()开关的重瓦斯保护应投跳闸。
A.有载分接
B.本体
C.无载分接
D.绕组
参考答案:A, B
根据句意及汉语提示完成句子
1. Tom ________(冲)into the room because a dog was running after him.
2. Have you_______(锁)the door?
3. Is Mr. Green your distant________(亲戚)?
4. Don't_________(忘记)to take the umbrella with you.
5. _________(不幸地),by the time I got to the bus stop, the bus had already left.
主蒸汽管道保温后,可防止热传递过程发生。