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【单选题】
真实气体向真空绝热自由膨胀后,下列说法正确的是A.
内能减小，对外作功
B.
内能不变，温度不变
C.
内能减小，温度可能减小也可能不变
D.
内能不变，温度变化不一定
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举一反三
【简答题】A.To raise a dog at home. B.To note down things to be grateful for. C.To chat with friends. D.To listen to stories about gratitude.
【单选题】To raise awareness of your company and products, we may ask you to provide information to participate in certain voluntary promotions, surveys, or contests.
A.
prematurely
B.
marginally
C.
occasionally
D.
uncommonly
【简答题】下列选项中，不属于企业捐款的动机的是（ ）。
【单选题】A city wants to raise revenues to build a new municipal swimming pool next year. The mayor suggests that the city raise the price of admission to the current municipal pools this year to raise revenu...
A.
the mayor
B.
the city manager
C.
The answer depends on the price elasticity of demand.
D.
The answer depends on the costs of construction of the new municipal swimming pool.
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