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【单选题】
若已知PV=220元 EV=200元 AC=250元 BAC=1000元,则此时项目CPI与成本绩效( )A.
0.2 ，实际成本与计划一致
B.
0.8 ，实际成本比计划成本低
C.
0.8 ，实际成本超过计划成本
D.
1.2 ，实际成本比计划成本低
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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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