问题
填空题
某定值电阻的阻值为20Ω，通过此定值电阻的电流为2A，通电100s时，电流通过该电阻产生的热量为 _________ J．
答案
8000
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某定值电阻的阻值为20Ω，通过此定值电阻的电流为2A，通电100s时，电流通过该电阻产生的热量为 _________ J．
8000
| 阅读理解。 | ||||
Read the advertisements carefully. Then answer the questions that follow.
| ||||
| 1. You may find the above advertisements _____. | ||||
| A. in a store window B. in a school magazine C. in a newspaper D. on a company notice-board | ||||
| 2. The position of a(n) _____ is a part-time job. | ||||
| A. florist B. artist C. preschool teacher D. dental nurse | ||||
| 3. Which of the following is the most important for the childcare job? | ||||
| A. Cooking skills. B. Childcare experience. C. The ability to start work in two weeks. D. The ability to work well with other people. | ||||
| 4. The office leaners will be required to work about _____ hours a week. | ||||
| A. 5 B. 10 C. 15 D. 20 |