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【单选题】
设 是来自正态总体 的简单随机样本,则服从 分布的统计量是( ).A.
;
B.
;
C.
;
D.
.
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举一反三
【单选题】The train was crowded and I had to get into a carriage______there were already seven other people.
A.
when
B.
where
C.
which
D.
that
【单选题】There were no more than seven people living in the house.In the house she found a few things for seven people.
A.
Right
B.
Wrong
C.
Doesn't say
【判断题】There were running in the garden a group of children aged from seven to twelve. 句子主语是花园
A.
正确
B.
错误
【单选题】共析碳钢加热为奥氏体后，冷却时所形成的组织主要决定于( )。
A.
奥氏体加热时的温度
B.
奥氏体在加热时的均匀化程度
C.
奥氏体冷却时的转变温度
D.
奥氏体化后的晶粒度
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