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【单选题】
有甲、数列,已知甲组平均值为70,标准差7.07;乙组平均值为7,标准差为3.41,根据以上资料可以判断()A.
甲数列的平均值代表性大
B.
乙数列的平均数代表性大
C.
两数列的平均数代表性相同
D.
无法做出判断
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A.
document.replace( );
B.
document.reload( );
C.
location.replace(href);
D.
location.reload( );
【判断题】Mark Twain（马克·吐温）was an American writer（作家）.One day he went to a city by train.He wanted to see one of his friends there.He was a very busy man.He usually forgot something. When he was in the train,th...
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【单选题】一水平放置的弹簧振子作简谐振动，其总能量为E。如果简谐振动的振幅增加到原来的四倍，而重物的质量变成原来的四分之一，则弹簧振子的总能量变为 [ ]
A.
E
B.
4 E
C.
8 E
D.
16 E
【判断题】Mark Twain（马克·吐温）was an American writer（作家）.One day he went to a city by train.He wanted to see one of his friends there.He was a very busy man.He usually forgot something. When he was in the train,th...
A.
正确
B.
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【单选题】在 JavaScript 中,能够实现页面重新加载的选项是 ( )
A.
document.replace( );
B.
document.reload( );
C.
location.replace(href);
D.
location.reload( ) ;
【判断题】Mark Twain（马克·吐温）was an American writer（作家）.One day he went to a city by train.He wanted to see one of his friends there.He was a very busy man.He usually forgot something. When he was in the train,th...
A.
正确
B.
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