用电安全应做到:在移动带电设备时,必须先(),并保护好导线,以免磨损或拉断。
参考答案:切断电源
改写句子。
1. We have to stay in the classroom to wait for our teacher. (对划线部分提问).
_____ _____ you _____ _____ _____?
2. They are busy studying for the test. (对划线部分提问)
_____ _____ they busy _____?
3. Do you want to join us?
_____ you _____ _____ _____ us?
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