对( )的防护，是直接减少源的辐射、屏蔽辐射源、采取个人防护

搜题请搜索小程序“爱下问搜题”

问题单项选择题

对( )的防护，是直接减少源的辐射、屏蔽辐射源、采取个人防护及执行安全规则的措施之一。

A．高频电磁场
B．微波辐射
C．红外线辐射
D．紫外线辐射

答案

参考答案：B

阅读理解

读短文，判断正(√)误(×)。

I'm Alice. This is our school. It is big. This is my classroom. It's big and clean. Look! That is my desk. It is

yellow. My teacher is Miss Li. She is in the classroom. She is a good teacher. I like my teacher.

( ) 1. My name is Alice.

( ) 2. My school is small.

( ) 3. My classroom is dirty (脏的).

( ) 4. My desk is yellow.

( ) 5. Miss Li is not in the classroom.

单项选择题

小明坐在汽车内，看到窗外的树木正在运动，则他所选的参考系可能是（）

A.大地

B.树木

C.房子

D.汽车