问题
问答题
工质节流前，后状态参数有什么变化？
答案
参考答案：
节流过程可以认为是绝热过程。节流前后工质的焓值不变，压力降低，温度降低，熵和比容增加。对湿蒸汽，绝大多数节流后，干度增加。湿蒸汽节流后可能变为饱和蒸汽，饱和蒸汽节流后可以变为过热蒸汽。蒸汽在节流前后虽然焓值不变，但因熵增加，使蒸汽的品质下降，做功能力下降。
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工质节流前，后状态参数有什么变化？
参考答案：
节流过程可以认为是绝热过程。节流前后工质的焓值不变，压力降低，温度降低，熵和比容增加。对湿蒸汽，绝大多数节流后，干度增加。湿蒸汽节流后可能变为饱和蒸汽，饱和蒸汽节流后可以变为过热蒸汽。蒸汽在节流前后虽然焓值不变，但因熵增加，使蒸汽的品质下降，做功能力下降。
| 阅读理解。 | ||||||
| Read the following text and choose the most suitable heading from A-F for each paragraph. There is one extra heading which you do not need.
newspaper can be a great learning experience and is a respectable thing to put on a resume(简历) in the future as it shows your interviewer your leadership skills and that could very well help land you the dream job for your future. Being part of the school newspaper will give you a good idea on other people you barely know and also it will give you a chance to learn what goes on in the school.
party, and that is authority. A teacher is there primarily to help make sure that everyone gets their articles in on time. With a teacher, staff simply feel an obligation to get their articles in. This really makes your job a lot easier. A teacher not only sees to it that articles are handed in on time, with a teacher around, staff will quit over 80% less.
hinting on weapons, violence, drugs, or basically anything that's illegal or not fit for middle school.
contest, short story, advice, random facts, sports, poetry or fashion. Once you have these articles planned out, open a word document and come up with cool titles and layout for your newspaper. You can copy a few things from the internet, but if it has a copyright, make sure to say where you got them from.
because life consists of all things, e.g. sickness, vacation, family affairs etc. Also tell them to let you know if they can't get one article in so you can cover for them. Print off the schedule and give it to all your staff members. |