题干

几个同学在实验室中看到甲、乙两只外形相同的灯泡,铭牌标注如图所示 . 下面是他们在讨论中提出的几种说法,其中正确的是(   )


A:甲、乙两灯都正常发光时,甲灯的电功率大于乙灯的电功率

B:甲、乙两灯都正常发光时,甲灯的电阻大于乙灯的电阻

C:甲、乙两灯都正常发光时,通过灯丝的电流均为1A

D:两灯串联在9V的电源上时,通过它们的电流不相等

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答案(点此获取答案解析)

A,B,C

同类题2

阅读短文,按要求完成各题。

    I was ten when I first sat with my grandmother behind the cashier(收银台)in her general store.____ I quickly learned the importance of treating customers politely and saying “thank you.”

    At first I was paid in candy.____ I worked every day after school, and during the summer and on weekends and holidays from 8 a.m. to 7 p.m. My father helped me set up a bank account.____ 

    By the time I was 12, my grandmother thought I had done such a good job that she promoted me to selling cosmetics(化妆品). I developed the ability to look customers directly in the eye. Even though I was just a kid, women would ask me such things as “ What color do you think I should wear?” I took a real interest in their questions and was able to translate what they wanted into makeup(化妆)ideas.____

    The job taught me a valuable lesson: to be a successful salesperson, you didn't need to be a Rocket scientist—you needed to be a great listener.____ Except they are no longer women purchasing cosmetics from me; instead, they are kids who tell me which toys they would like to see designed and developed.

A. Later I received 50 cents an hour.

B. Before long, she let me sit there by myself.

C. I ended up selling a record amount of cosmetics.

D. Today I still carry that lesson with me: I listen to customers.

E. My grandma's trust taught me how to handle responsibility.

F. Soon I found myself looking more beautiful than ever before.

G. Watching my money grow was more rewarding than anything I could have bought.