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【单选题】
在两个总体均值比较的t检验中,原假设是( )A.
两样本均数不等
B.
两样本均数相等
C.
两总体均数不等
D.
两总体均数相等
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参考解析：
知识点：
皮皮学刷刷变学霸
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【简答题】Our school is so beautiful (改为感叹句) our school is !
【单选题】β受体阻断药除能阻断受体外,还可以在一定程度上激动β受体,此作用称为
A.
膜稳定作用
B.
肾上腺素的翻转作用
C.
内在拟交感活性
D.
抗组胺作用
E.
抗H1作用
【单选题】Our national scenery Zhangjiajie is so charming that it is______description.
A.
out
B.
beside
C.
over
D.
beyond
【单选题】--- Our school is so beautiful. --- Yes. So our teachers ______ at school to enjoy its beauty.
A.
prefer to stay
B.
prefer staying
C.
prefer to staying
D.
prefer stay
【单选题】— Our country is becoming richer and stronger. — _____. [ ]
A.
So it is
B.
So is it
C.
It is so
【简答题】Our school is so beautiful. _____ _______ Our school is!
【单选题】A skilled workforce is essential, is why our training program is so important.
A.
that
B.
which
C.
such
D.
what
【简答题】血清学鉴定法 主要是根 据未知的 和已知的 结合产生反应来判断病毒的有无。
【简答题】在标准大气中,飞机在空中测得的气温是 -24 °C ,则飞机所在的高度是?
相关题目：
【单选题】— Our country is becoming richer and stronger. — _____. [ ]
A.
So it is
B.
So is it
C.
It is so