问题
填空题
输电线路发生瞬时故障，由于继电保护的原因，在断路器跳闸后拒绝重合，定为管辖该继电保护单位电气或变电（）。
答案
参考答案：事故
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输电线路发生瞬时故障，由于继电保护的原因，在断路器跳闸后拒绝重合，定为管辖该继电保护单位电气或变电（）。
参考答案：事故
| 用所给单词的适当形式填空。 |
| 1. I already _ ( finish) my homework. What about you? 2. — Has he finished his homework? —Yes. He (finish) it ten minutes ago. 3. —Has Mary (buy) a street map? —No, not yet. She (sweep) the floor just now. 4. — Have you cleaned the room? —Not yet. I ______ ______(do) it in a minute. 5. _ you ever __ (buy) a newspaper? |
