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【单选题】
蒸气压缩式理论循环并未假设制冷剂在 。A.
压缩机中是等熵过程
B.
换热器中是等压过程
C.
膨胀阀前后焓相等
D.
冷凝器中是等温过程
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【简答题】关于资产支持证券，下列说法正确的是（ ）
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【单选题】In Europe and Asia, the first 'medium of exchange' or 'standard of value' was not gold or silver, but cattle. In other parts of the world, however, such different commodities as salt, shells, stones a...
A.
people used to prefer gold and silver as their medium of exchange
B.
money was invented first in Europe and then in Asia
C.
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D.
the earliest coins were made quite differently from those we are using now
【单选题】下列关于资产支持证券的说法中正确的是( )。
A.
资产支持证券没有到期期限
B.
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C.
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D.
我国目前还没有资产支持证券产品
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