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【多选题】
“轨道电子俘获”也是放射性同位素衰变的一种形式,它是指原子核(称为)俘获一个核外电子,其内部一个质子变为中子,从而变成一个新核,并且放出一个中微子的过程。中微子的质量很小,不带电,很难探测到,人们最早就是通过子核的反冲而间接证明中微子的存在的。下面关于一个静止的原子核发生“轨道电子俘获”,衰变为新核并放出中微子的说法中,正确的是( )A.
的电荷数大于子核的电荷数
B.
的质量数等于子核的质量数
C.
新核动量的大小等于中微子动量的大小
D.
新核的动能大于中微子的动能
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【单选题】Commercial Vices The commercial vices are gambling, prostitution, and drugs. The appeals of the commercial vices are so strong and widespread that attempts to prohibit them in western democracies have...
A.
the police force could be reduced
B.
illegal dealers would be forced out of business
C.
there would be no more drug dealers
D.
the practices might become a source of revenue
【简答题】在我的记忆中,写信是14岁那年开始的秘密。 那个时候,我的身体与心绪正在发生微妙变化。闭塞而又贫穷的小山村让我找不到人交谈,和班上的同学、代课老师,也没有共同语言。我在寂寞中渴望与远方交流。可远方太远,我怎么也够不着,除了止不住的无边想象,唯一能接触的就是收音机里播出的“文艺听众之家”节目。星星与萤火虫出没的夏夜,我时常躺在屋外草地的凉席上,头枕微风,微闭双眼,闻着丝瓜藤里的花香,一直听到入梦,最...
【单选题】Commercial Vices The commercial vices are gambling, prostitution, and drugs. The appeals of the commercial vices are so strong and widespread that attempts to prohibit them in western democracies have...
A.
the police force could be reduced
B.
illegal dealers would be forced out of business
C.
there would be, no more drug dealers
D.
the practices might become a source of revenue
【简答题】commercial draft
【简答题】Commercial Bill
【单选题】Commercial Vices The commercial vices are drugs. The appeals of the commercial vices are so strong and widespread that attempts to prohibit them in western countries have always failed. The evils of t...
A.
because the quality of regulated liquor became assured and taxed.
B.
because the bootlegging became a source of public revenue.
C.
because they settled trade disputes with gunfire but without profit.
D.
because there was no more revenue worth risking their lives.
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