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【判断题】
在纯电感交流电路中加在线圈两端电压超前流过电感线圈的电流90°。( )A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文：W: I ought to call Joan and tell her about the reception of this evening. M: Why bother? You'll see her at lunch. What does the man mean?
A.
The woman can tell Joan when she sees her at noon.
B.
The woman should tell Joan's brother about the reception.
C.
The woman must call on Joan after the reception.
D.
The woman may see Joan's brother at lunch.
【简答题】一个（）通常由：（）等三部分组成。火灾探测器：安装于火灾可能发生的场所，将现场火灾信息（烟、光、温度）转换为电气信号，为区域报警器提供火警信号；区域报警器：接收一个探测防火区域内德各个探测器送来的火警信号，集中控制和发出报警的控制器；集中报警器：接收来自各区域报警器送来的火警信号，并发出声、光警报信号，启动消防设备。
【单选题】Wendy spends $30 a week on movies and magazines. The price of a movie is $8, the price of a magazine is $2, and Wendy sees 3 movies a week and buys 3 magazines. The price of a magazine now increases t...
A.
3; 33; 3
B.
less than 3; less than 3小于3;小于3
C.
more than 3; fewer than 3超过3;少于3
D.
less than 3; more than 3小于3;超过3
【单选题】听力原文：W: I ought to call Joan, and tell her about the reception this evening. M: Why bother? You will see her at lunch. Q: What does the man mean? (8)
A.
The woman can tell Joan when she sees her at noon.
B.
The woman should tell Joan's brother about the reception.
C.
The woman must call on Joan after the reception.
D.
The woman may see Joan's brother at lunch.
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