问题
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| 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．  |
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答案
答案：D
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| 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：D
| 完形填空。 |
| This is 1 English girl. 2 name is Mary. 3 is ten. She is l.3 4 tall. 5 favourite colour is red. Her favourite 6 is skirt. She lives 7 Eighth Avenue. It is 8 from school. So she often goes to school 9 bus. |
| ( ) 1. A. the ( ) 2. A. His ( ) 3. A. They ( ) 4. A. metre ( ) 5. A. His ( ) 6. A. clothes ( ) 7. A. from ( ) 8. A. near ( ) 9. A. take | B. an B. Her B. He B. metres B. Her B. food B. on B. far B. by | C. a C. She C. She C. / C. Our C. colour C. in C. / C. in |