100L初态参数为140kPa、10℃的氩经可逆多变压缩过程变化到700kPa、280℃，求过程的热量。
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压力维持200kPa恒定的汽缸内有0.25kg饱和水蒸气。加热后水温度升高200℃，求过程的加热量。
Questions 16 to 19 are based on the passage you have just heard.
A. They are motorcycles designated for water sports.
B. They are speedy boats restricted in narrow waterways.
C. They are becoming an efficient form. of water transportation.
D. They are getting more popular as a means of water recreation.
A.They scare whales to death.B.They produce too much noise.C.They discha
A. They scare whales to death.
B. They produce too much noise.
C. They discharge toxic emissions.
D. They endanger lots of water life.
A.To show people how to get their lives back to normal.B.To show how difficult it
A. To show people how to get their lives back to normal.
B. To show how difficult it is for people to lose weight.
C. To remind people to check the calories on food bags.
D. To illustrate how easily people abandon their goals.
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