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第1题

I don’t think _____. ( )(本题2.5分) A、 it true that he came to the concert yesterday B、 that he came to the concert
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第2题

关于节点导纳矩阵Y,以下说法错误的是:( )(本题1.5分) A. 是复数方阵 B. 一定存在与其对应的阻抗矩阵 C. 是稀疏矩阵 D. 既包含元件特性约束,又包含网络拓扑约束
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第3题

Working hours in the United States ____ over the past 20 years. ( )(本题2.5分) A、 were increasing B、 have been incr
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第4题

By the time Jane gets home, her aunt ____ for London to attend a meeting. ( )(本题2.5分) A、 will leave B、 will have
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