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【单选题】
由组距变量数列计算算术平均数时,用组中值代表组内标志的一般水平,有一个假定条件,即 ( ) 。A.
各组的次数必须相等
B.
各组标志值必须相等
C.
各组标志值在本组内呈均匀分布
D.
各组必须是封闭组
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举一反三
【单选题】—Tom's mistakes in the exam are almost as ______ as Jack's. —I know that boy. He's ______ than Jack.
A.
much no more careful
B.
much not more careful
C.
many no more careful
D.
many not more careful
【简答题】与传统生产方式相比，准时化生产有哪些优点?
【单选题】I’m sure he’ll ______ at tomorrow’s meeting, but I don’t know what he will ____.
A.
say, speak
B.
speak, say
C.
talk, say
D.
tell, speak
【单选题】- Jack is in a bad mood because he failed in yesterday’s exam. - __________? As far as I know, he is doing fine work at school.
A.
How come
B.
So what
C.
What’s it all about
D.
Have you got that
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