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第1题

In （ ）,the use of first names is restricted to close friends and colleagues who have known each other for a long period
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第2题

单相桥式全控整流电路带反电动势阻性负载，与带纯阻性负载比较，输出电压（）。 A.增大 B.减小 C.不变 D.以上都不正确
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第3题

After picking the visitors up at the airport, they should then be driven to their hotel A.host B.visitors themselves
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第4题

When meeting the visitors at the airport in the morning, it is ( ) to extend a dinner invitation with your visitors. tir
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