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【多选题】
防虫网的类型一般有？A.
银灰色防虫网
B.
白色防虫网
C.
铝箔条防虫网
D.
黑色防虫网
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反馈参考答案：
举一反三
【单选题】To compute an interval estimate for the difference between the means of two populations, the t distribution
A.
is restricted to small sample situations
B.
is not restricted to small sample situations
C.
can be applied when the populations have equal means
D.
None of these alternatives is correct.
【简答题】试评德国宗教改革时期的历史论战。
【简答题】史论
【单选题】In a hypothesis test comparing two means of the independent normal populations, we use the t distribution test statistic when ( )
A.
both population standard deviations are known.
B.
both population standard deviations are unknown.
C.
the two population standard deviations are equal.
D.
both populations have at least 50 observations.
【单选题】Shanghai is one of the largest cities in the world that______large populations each over ten million.
A.
has
B.
have
C.
had
D.
are
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