天然放射现象中的三种射线是_____、_____、____ ；这三种射线的实质分

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问题填空题

天然放射现象中的三种射线是_____、_____、____ ；这三种射线的实质分别是________。

答案

α射线；β射线；γ射线；氦原子核、高速电子流、波长很短的电磁波

阅读理解

阅读短文，判断句子正(T)误(F)。

Mr. Green is an Englishman. He is a teacher. He teaches English in No. 15 Middle School in Beijing. He likes

teaching a lot. He goes to work by school bus every morning.

There are fifty students in his class. He speaks English with them in class. He plays games with them after

class. He likes them very much. And his students love him, too. They are good friends.

( ) 1. Mr. Green is Canadian.

( ) 2. He likes teaching very much.

( ) 3. He goes to work by bike every morning.

( ) 4. He speaks Chinese in class.

( ) 5. He likes his students very much.

判断题

ADC256色彩对位控制在图像稳定时执行。