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【单选题】
一台工作于温度分别为 prefix="st1" ns="urn:schemas-microsoft-com:office:smarttags" 327 °C 和 27 °C 的高温热源与低温热源之间的卡诺热机,每经历一个 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> ?xml:namespace> 循环过程吸热 2000 J ,则对外作功( )A.
2000 J
B.
1000 J
C.
4000 J
D.
500 J
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【简答题】Some companies start to employ various methods to reveal more about their operations.
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【单选题】To attract more customers, some large stores ______.
A.
employ a company specializing in the use of smells
B.
provide free coffee for them
C.
filter purified air through air-conditioning
D.
decorate themselves with fresh flowers
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【简答题】(employ) ______ of children under 18 is prohibited in some countries.
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