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U形管式换热器适用于管壳壁温差较大的场合,尤其是管内介质清洁,不易结垢的高温、高压、腐蚀性较强的场合。A.
正确
B.
错误
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【简答题】英译中 Thus, in the American economic system it is the demand of individual consumers, coupled with the desire of businessmen to maximize profits and the desire of individuals to maximize their incomes, ...
【简答题】The big changes in economic activity, culture, individual behaviours and thinking method were resulted from new patterns of interaction.
【单选题】根据下列短文，回答下列各题。 There are various in which individual economic units Can interact with one another．Three basic ways may be described as the market system，the administered system and the traditional sys...
A.
To outline contrasting types of economy．
B.
To explain the science of economics．
C.
To argue for the superiority of one economics．
D.
To compare barter and money exchange markets．
【简答题】Without individual national currencies, countries lost the ability to adjust to economic ups and downs through______.
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