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【判断题】
汽车刮水器的自动停位机机构确保了刮水器工作结束时将雨刷停在合适位置。 ( )
A.
正确
B.
错误
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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】在HTML常用标记中,换行标记是用______标记来表示的。
【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
【多选题】下列哪些是影响放射性核素有效半衰期的因素 ( )
A.
物理半衰期
B.
核的衰变方式
C.
射线的能量
D.
生物半衰期
E.
放射性核素的初始活度
【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 game lose money in the end because they don't know the rules of the game.
A.
正确
B.
错误
【简答题】放射性核素常见的衰变方式有 、 、 。
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