搜题
王老师:19139051760(拨打)
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第1题

Before the final examination, some students have shown of tension. They even have trouble in sleeping.
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第2题

判断一段电路是产生还是消耗功率与所设的电压、电流参考方向都无关。
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第3题

Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.
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第4题

As I am sure he is very honest, I ______ that he stole the money.
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