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【单选题】
对于中小型电力变压器,投入运行后每隔( )要大修一次。A.
1年
B.
2~4年
C.
5~10年
D.
15年
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【简答题】Cheerful Charlie was a very special boy. When he was still in his mother’s tummy(肚子), she had had an accident, which 36 that Charlie couldn’t walk. But that had never been a(n) 37 for him; he had alwa...
【简答题】完形填空 Cheerful Charlie was a very special boy. When he was still in his mother's tummy (肚子), she had had an accident, which 1 that Charlie couldn't walk. But that had never been a(n) 2 for him; he had ...
【简答题】常用的增溶剂分为()、()、()。常用的助溶剂有()、()两类。
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