圆锥的底面直径为6cm，母线长为5cm，则圆锥的侧面积是　　cm2．

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问题填空题

圆锥的底面直径为6cm，母线长为5cm，则圆锥的侧面积是　　cm²．

答案

15πcm²．

题目分析：底面直径为6cm，则底面周长=6πcm，圆锥侧面积=×5π×6=15πcm²．

考点: 圆锥的计算．

阅读理解

读短文，根文内容选择答案。

We are on a train now. There are many people on the train. I see some women talking. They laugh loudly.

My brother Tom is looking out the window. "I see a bird flying," he says. "I can't see. Point to it, Tom." I

say. "There! In the sky, a black bird!" he says. Yes, I see the bird. It's big and beautiful. My mother is

reading a book. My father is sleeping. They are quiet. Now, it's one o'clock. Everyone is hungry. So we

decide to have some fruits.

1. There are many _______ on the train.

A. men

B. women

C. people

2. Some women are ________ .

A. talking quietly

B. talking loudly

C. quiet

3. Tom sees a _______ bird.

A. black

B. brown

C. blue

4. What is mother doing?

A. Sleeping.

B. Talking.

C. Reading.

5. What will we have?

A. Some soup.

B. Some dumplings.

C. Some fruits.

填空题

转速小于3000r/min且功率较小的风机采用（）。