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第1题

The almost bare sheets in the file mocked the effort. A. She tried in vain to write the obituary. B. She made great e
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第2题

Then the third grade note had opened the attack. A. Then the third grade teacher began to speak ill of him. B. Then t
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第3题

“It`s no use having a dog without teeth ,” they argue. A. A dog without sharp teeth doesn`t frighten burglars away. B
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第4题

试述功率因数与负载功率的关系及对电源利用方面的影响
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