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B.listen to the conversation againand then fill in the missing words.[音频]Officer: Good afternoon, sir. May I see your___1____and declaration, please?Peter: Of course. Here you are.Officer: Thank you… You are Peter Brown.Peter: Yes.Officer: Where are you from, Mr. Brown?Peter: ____2___ , England.Officer: And what is the ___3____ of your visit?Business or pleasure?Peter: ___4____ business and ___5____ pleasure.Officer: I see. ____6____ will you be staying in the U.S.?Peter: About a month. At least __7_____, I think.Officer: Where do you intend to travel ___8_____in the country?Peter: Washington, D.C. first; then I’ll be headingon to____9____.Officer: Fine, I have to check your luggage now, Sir.Peter: Okay, I have___10____ and a box with___11_____.Officer: What do you have in the suitcase?Peter: Clothes and____12_____.Officer: All right. Thank you very much for your ____13____.

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Passage :Is This My Suitcase?[音频][音频]______ 1.The speaker went to Florida for an important meeting.______ 2.The speaker went to a café because the flight was notdue to board for half an hour._______3.In the speaker’s suitcase, there were documents for his meeting, men’s clothes and scientific papers.________4.The speaker felt excited after he opened the case._______ 5. On board the plane, the speaker couldn’t find hissuitcase.

为了消除二进制码盘的输出粗大误差,可采用双读数头法或者用循环码代替二进制码。双读数头法是利用()位码控制()位码的,整个编码器的精度由它的最低位决定。

A. 高,低
B. 低,高

光电管、光电倍增管的工作原理是基于(),即在光线作用下使物体的电子逸出表面的现象。

A. 光生伏特效应
B. 阻挡层光电效应
C. 外光电效应
D. 内光电效应

光敏电阻的工作原理是基于( )。

A. 磁电效应
B. 光生伏特效应
C. 外光电效应
D. 内光电效应

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