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【判断题】
“三及时”是指将需要的零件在需要的时间按需要的数量供给每一道工序，保证要什么就及时给什么，需要及时送到，要多少就及时给多少。()A.
正确
B.
错误
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皮皮学刷刷变学霸
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【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
【单选题】They practice basketball almost everyday. [ ]
A.
play
B.
to play
C.
playing
D.
playing the
【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
【判断题】Students playing the lose money in the end because they don't know the rules of the .
A.
正确
B.
错误
【简答题】放射性核素常见的衰变方式有 、 、 。
相关题目：
【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