在阳光下，肥皂泡表面呈现出五颜色六色的花纹，这是光的（）

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问题选择题

A．反射现象

B．干涉现象

C．偏振现象

D．折射现象

答案

答案：B

在阳光下，肥皂泡表面呈现出五颜色六色的花纹，这是光的薄膜干涉现象

故选B

句型转换

句型转换。

1. I think he will come back soon. (否定句)

I _______ think he _______ come back soon.

2. The classroom is opposite the library.(对划线部分提问)

_______ the classroom?

3. He went to school by underground yesterday. (对划线部分提问)

_______ _______ he _______ to school yesterday?

4. How is the weather in your home town in summer? (同义句)

_______ the weather _______ in your home town in summer?

5. It's only ten minutes from my home to school by bicycle. (同义句)

It _______ only ten minutes _______ ride to school.

6. Do you know where we can get the information? (同义句)

Do you know where _______ _______ the information?

单项选择题

钻床钻削结束时，应将横臂( )，主轴箱( )轴并夹紧。

A．升到最高位置；远离
B．升到最高位置；靠近
C．降到最高位置；靠近
D．降到最高位置；远离