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【单选题】
关于统计分组的说法，正确的是( )。A.
组数的确定，要尽量保证组间资料的差异与组内资料的同质性
B.
对于变量值较少的离散变量，通常采用组距分组
C.
统计分组时习惯上规定“下组限不在内”
D.
组距与组数成正比关系，组数越多，组距越大
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【单选题】Drug use is rising dramatically among the nation's youth after a decade of decline. From 1993 to 1994, marijuana use among young people (1)_____ from 12 to 17 jumped 50 percent. One in five high schoo...
A.
aged
B.
aging
C.
age
D.
ages
【单选题】The prices have been rising all the time, especially that of housing. So it is high time the government _______ action to solve it.
A.
takes
B.
have taken
C.
took
D.
to take
【简答题】如图所示电路,根据以下各种情况,判断 A 、 C 两点电位的高低。
【简答题】如图所示电路,根据以下各种情况,判断 A 、 C 两点电位的高低。
【简答题】Teachers encourage the use of dictionaries so that
【多选题】The rising use of social networking sites could be attributed to _________.
A.
sociocultural forces
B.
technological forces
C.
legal forces
D.
economic forces
【单选题】选择如下Java代码,下列()方法可以将其加入到Sample类中,并且能够编译正确 public class Sample{ public int getSomething(int d){ return d; } }
A.
private int getSomething (int i,String s){}
B.
public void getSomething (int i){}
C.
private int getSomething(int i,String s){ return 20;}
D.
public double getSomething(){return "abc"}
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