简述自然循环和强制循环的适用范围?

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问题:

简述自然循环和强制循环的适用范围?

考点:热力司炉工考试中级热力司炉工中级热力司炉工题库
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Electronic (电子的) books, or e-books, have changed the way many of us read. Now, electronic textbooks are changing the way many students    1  . Many schools in Washington have begun using online course materials for their students. Rather than using a regular textbook, it’s all online.
“Our students are ready to use resources (资源) from different   2  ,” said the head teacher, Peter Noonan. He talked about the   3   of electronic textbooks to a reporter. “The world is changing   4 . Online textbooks can change right along with the things that are happening.  Besides, electronic textbooks   5  less than regular textbooks. We need to pay $8 million for the regular textbooks for our students, but we only need to spend $6 million   6   the electronic textbooks,” said Peter Noonan.
Students have different ideas about the change,   7  most like it. “I don’t have to carry a textbook around, so that is   8  ,” said a high school student named Melanie Reuter. Maria didn’t   9 . “I don’t like it because the Internet sometimes doesn’t work.”
Some students don’t have a computer or can’t go online at home. Stephen is   10  of them. But he said, “I can go to the library, or go to a friend’s house, to go online.”
小题1:
A.eatB.learnC.sleep D.walk
小题2:
A.newspapersB.schoolsC.placesD.grades
小题3:
A.advantagesB.progressC.messages D.environment
小题4:
A.normally B.slowlyC.possiblyD.fast
小题5:
A.happenedB.costC.endedD.behaved
小题6:
A.forB.inC.at D.on
小题7:
A.butB.orC.until D.and
小题8:
A.politeB.rudeC.goodD.bad
小题9:
A.appearB.stayC.agreeD.arrive
小题10:
A.anotherB.oneC.other D.neither
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判断各方面工作的是非得失的根本标准是看是否有利于______。

A.增强社会主义国家的综合国力

B.多种经济成分的长期共同发展

C.发展社会主义社会的生产力

D. * * 党领导的多党合作,政治协商制度

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商品展示策略得当可以刺激顾客作出购买的决定。

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支气管扩张症最有意义的体征是()

A.贫血

B.杵状指

C.消瘦

D.固定的局限性湿啰音

E.多变的哮鸣音

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下面属于光缆线路日常维护内容的有().

A.路面及管道维护

B.架空光缆的维护

C.水线和海缆维护

D.护线宣传

E.线路隐患防范

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