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So a company needs discipline, and above all it needs to develop that Lombaridi talked about.

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This can be done through company functions and motivational events which enable staff to spend time together, with each other, and care for one another.

工作在100℃和25℃的两个大热源的卡诺热机效率η为

A. 20%
B. 25%
C. 50%
D. 75%

若热机的低温热源是空气，平均温度设为293K，为提高热机的效率，只有尽可能提高高温热源的温度。如果希望可逆热机的效率达到60%，试计算这时高温热源的温度为（）

A. 473 K
B. 673 K
C. 732.5 K
D. 273K

某热机循环一周, 从高温热源吸热200kJ, 向低温热源放热100kJ, 则 W = ( )

A. 100 kJ
B. -100 kJ
C. 0
D. 200 kJ