问题
判断题
220kV断路器的开断电流为21kA，将它更换为31.5kA的断路器。更换断路器后开断容量是S=U×I=220×31.5=6930MVA。
答案
参考答案：错
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220kV断路器的开断电流为21kA，将它更换为31.5kA的断路器。更换断路器后开断容量是S=U×I=220×31.5=6930MVA。
参考答案：错
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He is singing an English song. 2. ________________ does the train arrive? It arrives at about 3: 00 in the evening. 3. ________________ sweaters does the boy need? Only one. 4. ________________ is this pair of shoes? Eighty yuan. |