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问题 单项选择题

REU站位卡的作用是（）。

A.接收来自音频控制面板的控制入信号

B.提供PTT和音频信号到通讯系统

C.将来自通讯和导航接收机的音频信号送到驾驶舱各站位处

D.A+B+C

答案

参考答案：D

判断题

在小接地电流系统中，当发生单相接地时，三相线电压还是对称的，而三相相电压则不再对称，接地相电压为0，另两相电压也随之下降。
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完形填空

international school;  good treatment;   achievements;   discussion;   population;    pollution
小题1: They were proud of their children’s ______________.
小题2: The ___________ was terrible because the shoe factory used to dump its waste into the river.
小题3:Would you like to study in that ____________ ?
小题4:We had a long ______________ about the question.
小题5:They went to a big hospital for  ___________.
B） 根据句子意思，用括号中所给单词的正确形式填空。
小题6:This is the _________ time for our school to hold the robot-making contest. (twelve)
小题7:Larry has put on too much weight because of his _________ diet. (health)
小题8:You can’t go on driving if you feel ___________(sleep).
小题9:Mark Twain was a ___________(humour) writer.
小题10:It’s __________(possible) for you to study English well if you don’t work hard.
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