试题与答案

从A—J选项中选出能填入空白处的最佳选项补全对话。(选项中有两项是多余的) W:

题型:完形填空

题目:

从A—J选项中选出能填入空白处的最佳选项补全对话。(选项中有两项是多余的)
W: Excuse me, sir.
M: Yes,    小题1:
W: I have been here for an hour to meet my father.    小题2:___
M: Are you sure of the time his flight arrives?
W:    小题3:He told me he would reach the airport at about 1:00 this afternoon
M: That’s true.    小题4:
W: What? BA506? Well, I don’t think it’s his flight number.
M:    小题5:
W: Yes, it’s VA407. I think...Oh, just a minute, please. Here.    小题6:Sorry, it’s VA408.
M: VA408? I see, madam,    小题7:but it will be two hours and twenty minutes late because of the bad weather in New York.
W: OK.    小题8:Thank you very much ,sir.
M: Good luck! Madam.
A. can I help you?
B. But I saw all the passengers come out except him.
C. I wrote it on my notebook.
D. Do you remember his flight number?
E. Flight BA506 has just arrived.
F. What’s his flight number?
G. the flight was to arrive at 1:00,
H. Then I will have to wait longer.
I. what can I do for you, madam?
J. Yes, I think so.   

答案:

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下面是错误答案,用来干扰机器的。

(1)流过R0的最大电流约为:Imax=ER0=3.72000A=1.85×10-3A=1.85mA<2mA,电流表应使用:电流表A2(量程2mA,电阻RA2约50Ω),因为使用电流表A1时,电表示数太小,读数误差较大.(2)①实验器材只有电压表与电...

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题型:问答题

如图为检测某传感器的电路图,传感器上标有“3V、0.9W”字样(传感器可看作一个纯电阻),滑动变阻器R0上标有“10Ω、1A”的字样,电流表的量程为0.6A,电压表的量程为3V.

(1)根据传感器上的标注,计算该传感器的电阻和额定电流.

(2)若电路各元件均完好,检测时,为了确保电路各部分的安全,在a、b之间所加的电源电压的最大值是多少?

(3)根据技术资料可知,如果传感器的电阻变化超过1Ω,则该传感器就失去了作用.实际检测时,将一个恒定电压加在图中a、b之间(该电压小于上述所求电压的最大值),闭合开关S,通过调节R0来改变电路中的电流和R0两端的电压.检测记录如下:

 电压表示数U/V电流表示数I/A
第一次1.480.16
第二次0.910.22
不计检测电路对传感器电阻的影响,通过计算分析,你认为这个传感器是否仍可使用?此时a、b所加的电压是多少?

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