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【多选题】
指出下列分组哪些是属性分组 ( )A.
人口按性别分组
B.
企业按产值多少分组
C.
家庭按收入水平分组
D.
在业人口按文化程度分组
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反馈参考答案：
举一反三
【简答题】下列气体哪个属于刺激性气体（ ）。
【单选题】A __________ statement is a general term for a personalized financial record that regularly informs a recipient about the status of his or her account. It is generally mailed to the recipient on or ne...
A.
instantly
B.
weekly
C.
monthly
D.
daily
【简答题】有一个 50μF 的电容器,接到 的工频交流电源上,求电容的电流有效值和无功功率。若将交流电压改为 500 Hz ,求通过电容器的电流为多少?
【单选题】Arbitrage______.
A.
is a general economic term for buying something where it is cheap and selling it where it is dear
B.
keeps exchange rates consistent across markets
C.
has been outlawed by the International Monetary Fund
D.
cannot occur where there is a forward exchange market
E.
both A and B
【简答题】It is a general term for all the statistics used to describe the typical value of a variable.
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