两根铜丝的长度相同，粗细不同，则______铜丝的电阻大．一根铜丝和一根铁丝长度相同，要使它们的电阻相等，则______丝要粗些．
（1）因导体的长度、材料相同时，横截面积越小，电阻越大，所以两根铜丝的长度相同时，细铜丝的电阻大；
（2）导体的横截面积、长度相同时，导体的材料不同，电阻大小不同，
因铁丝的电阻率大于铜丝的电阻率，所以要使它们的电阻相等，则铁丝要粗些；
故答案为：细，铁．
| 阅读理解。 | ||
TV Programs in Beijing, Sunday, May 27, 2003 (CCTV)
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| 1. If an Englishman wants to know about what's happening in China, but he doesn't know any Chinese, he may watch TV at __________. | ||
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| A. 19:00 on CCTV- 1 Channel 2 B. 20:05 on CCTV- 1 Channel 2 C. 22:00 on CCTV- 2 Channel 8 D. 22:30 on CCTV- 2 Channel 8 | ||
| 2. If you are interested in football games , which of the following programs will you choose first? | ||
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| A. China Sports Report B. Special Sports C. Today's Focus D. China Music TV | ||
| 3. If you'd like to know the TV programs on both channels in the coming week ,please watch TV at _________. | ||
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| A. 23: 00 on CCTV - 1 Channel 2 B. 00: 20 on CCTV - 2 Channel 8 C. 21: 30 on CCTV - 2 Channel 8 D. both A and B | ||
| 4. If you are going to Guangzhou by plane from Yancheng Airport, you'd better pay attention to the program ________. | ||
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| A. Weather Report B. World-famous Cities C. Economy 30 Minutes D. The Story of Earth | ||
| 5. Which of the following is true? | ||
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| A. A TV Classroom is a room full of TVs. B. Most of the children love the program Cartoon City. C. The program Today's Focus is about today's traffic accidents. D. The program on CCTV-2 Channel 8 will stop at 23:00. |