试题与答案

在匀强磁场中有一个原来静止的碳14原子核,它放射出的粒子与反冲核的径迹是两个相内

题型:选择题

题目:

在匀强磁场中有一个原来静止的碳14原子核,它放射出的粒子与反冲核的径迹是两个相内切的圆,如图所示.那么碳14的衰变方程为(  )

A.+

B.+

C.+

D.+

答案:

答案:D

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题型:阅读理解

读短文,判断正(T)误(F)。

      My room is small, but the picture on the wall is very big. It is a beautiful picture. Look, there's a river in it.

Near the river there is a big tree. The tree has many green leaves. Some red and yellow flowers are under the

tree. Two girls in the red hats are under the tree, too. In the tree there are some birds. They are singing and

dancing happily.

( ) 1. The picture on the wall is very small.

( ) 2. There are flowers, a river, a tree and two boys in the picture.

( ) 3. Two girls are wearing red hats.

( ) 4. Two girls are singing and dancing.

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