机务维修服务区的主要作用是为飞机、发动机、机上各种设备提供大修服务。（）
参考答案：错
如图所示电路，要使灯L1、L2串联，应只闭合开关______，要使灯L1、L2并联，应只闭合开关______．同时闭合开关______，会烧坏电源和导线．
根据句义和所给首字母写出英语单词。
1. She drank a bottle of orange p______.
2. There are several spelling m_______ in you written work.
3. I'm c________. Could you please explain it again?
4. I'm always c_______ Sam and Yom. They look the same.
5. If you b______ with them, they might reduce the price.
