题目内容

泵入口的水焓值为200kj/kg，出口焓值为230kj/kg，泵对水做功的量为（）kj/kg。

A. 200
B. 230
C. 430
D. 30

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蒸汽喷嘴前的蒸汽焓为3000kj/kg，蒸汽速度100m/s，出口焓为800kj/kg。蒸汽出口速度为（）m/s。

A. 100
B. 120
C. 110
D. 130

热力系统的总储存能包括

A. 热力学能
B. 动能
C. 位能
D. 化学能

Basketball, the ultimate in 1 sports, can be played 2 or outdoors, in a gym or in the park. It doesn’t cost a lot to play, and it isn’t complicated, either. 3 you know a few rules and have some basic skills, you can walk up to any court and join a pickup game ( 临时组织的比赛 ).Basketball is great for building muscles. 4 the game requires a lot of starting, stopping, and sprinting ( 快速奔跑 ), it helps strengthen the lower body. 5 and shooting can develop muscles in the arms and shoulders. Obviously, the fitness benefits increase with the 6 of the game. Moreover, shooting increases your energy, endurance, and 7 , and thus can make other aerobic(有氧健身的) activities, such as walking, running, and skating, easier.However, before you start playing, it is necessary to spend a few minutes practicing throws or 8 the ball around to your teammates. It takes 5 to 10 minutes to warm up your muscles, get your heart rate elevated (升高的), and break a sweat (a sign that you’re ready to proceed). After the game, also take time to 9: Allow your heart rate to decrease gradually by 10 around the court or walking home.

适应在形态上表现出、、、。