空载电流和空载损耗对于发现（）、绕组变形、匝间绝缘缺陷以及分接开关缺陷等比较有效。
A.铁心结构
B.油质劣化
C.绝缘老化
D.绝缘受潮
参考答案：A
When his mother came in, the boy pretended .
A．reading
B．being read
C．to read
D．to be reading
根据句意,首字母或汉语提示完成单词
1. We must eat v _____ every day.
2. This is an e _____ and that is an apple.
3. What do you have for b _____?
4. Do you like _____ (鸡肉)? Yes , I do .
5. I like f _____ . for example (例如):apples, bananas and oranges.
