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【判断题】
关系数据库模型的3个要素分别为数据增加、数据修改、数据查询。A.
正确
B.
错误
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参考解析：
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皮皮学刷刷变学霸
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【简答题】TCP协议在每次建立或拆除连接时，都要在收发双方之间交换（）报文
【简答题】Translate the following sentences into Chinese. 1、 I want to reserve a single room which is better located between 4th floor to 7th floor.
【单选题】听力原文：W: Please turn off the lights, Harry. M: Why? What's the matter? I want to read the paper. W: If we turn on too many lights, all the electricity in the house will go off. M: Now who told you that...
A.
Their washing machine.
B.
The electricity.
C.
The lights.
【单选题】一个功率为40W、功率因数为0.5的日光灯接在220V/50Hz的电源上，则灯管点亮时的等值电阻为( )。
A.
1210Ω
B.
302.5Ω
C.
2420Ω
D.
12.1Kω
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