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【简答题】
变压器在运行时,当 损耗和 损耗相等时,效率最高。
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举一反三
【简答题】听力原文：Professor: Hello, Dinesh. Come in. You said on the phone that you had a few problems to discuss with me. Tell me what they are and I'll see what I can do to help. Dinesh: Thank you very much, pro...
【简答题】The examiner asks you and your partner to talk together. You may be asked to solve a problem or try to come to a decision about something. For example, you might be asked to decide the best way to use...
【单选题】If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be ___.
A.
insufficient speed
B.
cavitation
C.
excess discharge pressure
D.
excessive net positive suction head B
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