问题 实验题

现有:已经调好的符合要求的电压表一块、不同阻值的定值电阻10个、滑动变阻器一个、符合要求的电源一个,导线若干。

请你用以上器材设计一个实验,证明导体两端的电压和导体的电阻成正比。

(1)画出实验电路图;

(2)写出实验步骤

答案

(1)实验电路图如图所示

(2)实验操作步骤

①按照电路图连接实物. 

②定值电阻阻值用R表示,闭合开关,用电压表分别测出定值电阻两端的电压用U表示,将此时R和U的数据记录在表格中,断开开关。 

③依次将电压表并联在其他5个定值电阻两端,闭合开关,测出各定值电阻两端的电压U,将各次的R和U的数据记录在表格中。

完形填空

对话填空(共10题,共10分)

P:Peter       J:Jimmy

Peter is talking with Jimmy about the just finished match between L.A Lakers and Miami Heats on Christmas Eve, in 2010

P: Hey, Jimmy, watched the game between Lakers and Heats?

J: Certainly. It was really an 小题1:a_____ fantastic game. My Heats beat L.A.

P: Your Heats? I remembered you were a fan of the Cavaliers.

J: To be exact, a fan of Lebron James. Since James joined the Heats, I also changed my range, which is undoubtedly logical. By the way, which team do you 小题2:p_____ will win the title of 小题3:c_____ this season?

P: I think the Lakers will do

J:I don’t 小题4:a_____ of you. I strongly believe the title must go to the Heats. As you can see, the present Heats possesses the super “BIG THREE”, James is good at scoring. Wade is an expert in penetration(带球突破) and Chris Bosh can 小题5:d______ backboard(篮板)

P:Maybe you are right. But I am afraid you 小题6:l_____ out the 小题7:e______ element(因素) in winning a basketball game---- team work. After all, basketball is not an 小题8:i_____ game.

J:Apart from the “BIG Three”, there are quantities of excellent bench players available such as Dampier, Arios Arroyo, Eddie House and so on. I see no reason why the Heats can’t 小题9:p_____ the NBA

P: I still have a preference for the Lakes. Compared to the Heats, the Lakers has a more mature(成熟的) play. And as long as there is Kobe, there is victory. On the other hand, we should not forget that other teams are making rapid progress like the Thunder led by Kelvin Durant,the Celtics and the Magics. They all have the 小题10:p____ to challenge our teams.

单项选择题