甲、乙两盏灯、甲灯标有“220V100W”，乙灯标有“220V25W”，下列说法

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问题选择题

甲、乙两盏灯、甲灯标有“220V 100W”，乙灯标有“220V 25W”，下列说法正确的是（　　）

A．甲灯一定比乙灯亮

B．正常发光时，甲灯电阻大于乙灯电阻

C．正常发光时，甲灯电功率一定是乙灯电功率的4倍

D．正常发光时，甲灯消耗的电能一定是乙灯消耗的电能的4倍

答案

答案：C

阅读理解

阅读小天地。根据短文内容，判断下列句子的正(T)误(F)。

Boys and girls, welcome to my classroom. It's very big. The door is green. And there are many windows

in my classroom. They are yellow. There is a picture on the wall. There are fifty-five desks and chairs in my

classroom.

( ) 1. My classroom is big.

( ) 2. The door is yellow.

( ) 3. The windows are green.

( ) 4. There are 45 desks in my classroom.

( ) 5. We have a picture in the classroom.

单项选择题

个人用户上网需要有计算机、电话线、用户账号和口令，以及（）。

A.调制解调器

B.录像机

C.投影仪

D.交换机