小明用图甲所示的电路做实验，闭合开关S，移动滑动变阻器，读出_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

小明用图甲所示的电路做实验，闭合开关S，移动滑动变阻器，读出四组电流表和电压表对应的值，并在图乙的I－U坐标中找出这四组对应值的点，分别用a、b、c、d表示，由这四个点作出的I－U图像为一条直线，延长直线与I轴和U轴相交，交点如图乙所示．则下列结论不正确的是

A．变阻器最大阻值为10Ω

B．该电路最大功率为3.6W

C．电源电压U₀=6V

D．定值电阻R₀=10Ω

答案

答案：A

由乙图可知，电源电压是6V；电路中的最大电流是0.6A。定值电阻R₀=6V/0.6A=10Ω该电路最大功率为P=UI=6V*0.6A=3.6W;所以选A。

完形填空

阅读下面短文，从短文后各题所给的四个选项（Ａ、Ｂ、Ｃ和Ｄ）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
He fell in love with her at the first sight at a party. She was so outstanding while he was so 36 . At the end of the party, he invited her to have 37 with him. She was very 38 , but she promised.
Sitting in a nice coffee shop, he was too 39 to say anything. Suddenly he
said to the waiter,“ Would you please give me some 40 ?” Everybody stared at him, so strange！His face turned red, but still, he 41   the salt in his coffee and drank it.
She asked him 42 ,“Why do you have this 43 ?”
He replied,“ When I was a little boy, I was living near the 44 . Now every time I have the salty coffee, I always think of my childhood and my 45 .”
While saying that tears 46   his eyes. She was deeply 47 . That was a really nice talk, also a beautiful beginning of their story. Later they got 48   … And, every time she made coffee for him, she put some salt in the coffee, as she knew that’s the way he liked it.
After 40 years, he passed away, leaving her a letter which 49 :
My dearest, please forgive my lie, the only 50   I said to you --the salty coffee. The first time we 51   I was so nervous that actually I wanted some sugar. I 52   to tell you the truth many times, but I was too afraid to do that, as I have 53   not to lie to you forever… Having you is my biggest happiness even though I have to drink the salty coffee.
Her tears 54 the letter totally wet. Someday, someone asked her, “What’s the taste of salty coffee?” She replied, “It’s 55 .”

B．disappointed

单项选择题

窗户：玻璃

A．钞票：纸张

B．柜子：木头

C．武器：石头

D．抗生素：青霉素