题目内容

一个绝热活塞把刚性绝热密封气缸分成A和B两部分，A室与B室内装有同种理想气体。其C_p，m=29.184J/(mol·K)。活塞面积为0.1m²，气缸长度为0.3m。初始时A室占(1/3V)，P_A1=400K；P_B1=0.2MPa，T_A1=300K，活塞两侧的压力差与通过活塞杆上作用的外力F保持平衡。外力F缓慢减小，直至两室压力相等，此时测得A室内温度为354.6 K。若活塞与缸壁之间无摩擦，求终态时两室压力、温度和系统对外力作的功。

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Questions 16 to 19 are based on the passage you have just heard.

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C. They are becoming an efficient form. of water transportation.
D. They are getting more popular as a means of water recreation.

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Questions 16 to 19 are based on the passage you have just heard.

气缸中0.1kg的空气初参数是300K、100kPa，被等温压缩到
250kPa，求过程热量和功。