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【单选题】
You don’t say !A.
你别说！
B.
真的吗
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【简答题】放射性核素衰变的方式有α衰变、β衰变、正电子衰变、____、____。
【简答题】A．They are playing in the park. B．The woman is asking the way to the park. C．The man is seeing the woman off. D．They are going to visit the park.
【简答题】A．They are having a party. B．They are playing the piano. C．Someone else is having a party. D．Someone else is funny.
【简答题】放射性核素的衰变方式有 、 、 三种。
【单选题】They are now. [ ]
A.
play chess
B.
playing the chess
C.
play the chess
D.
playing chess
【简答题】翻译 1. We are watching TV. 2. They are cleaning the classroom. 3. Tom is having breakfast. 4. The twins are sleeping. 5. The boys are playing soccer. 6. She is the bed. 7. I am playing computer ...
【多选题】一个放射源的强弱与()有关。
A.
放射性原子核的数量
B.
所含核素的衰变常数
C.
所含核素的衰变方式
D.
所含核素衰变过程中放射出的粒子数目
E.
所含核素衰变过程中放射出的粒子类型
【简答题】核衰变方式分别有
【简答题】放射性核素常见的衰变方式有 、 、 。
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