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【简答题】
试证明： 设E是可列集，则E中存在可列个互不相交的真子集．
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举一反三
【简答题】John Brown wrote this essay. →
【简答题】Mr. Brown wrote the words down on _________.
【简答题】John Brown wrote this essay. 改为: wrote this essay?
【单选题】The ordinary family in colonial North America was primarily concerned with sheer physical survival and beyond that, is own economic prosperity. Thus, children were valued in terms of their productivit...
A.
The Place of Children in United States Society
B.
The Children of Colonial North American
C.
The Development of Cultural Values
D.
The Child as a Utilitarian Organism
【单选题】Which one of the following cannot substitute for 'sheer volume' in the first paragraph?
A.
Large amount.
B.
Large quantity.
C.
Great numbers.
D.
Great multitude.
【简答题】John Brown wrote this essay. → wrote this essay?
【简答题】A．It helps broaden one's horizons. B．It enhances family relationships. C．It is a sheer waste of time. D．It is unhealthy for the viewers.
【简答题】John Brown wrote this essay. 改为: ?
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