在充分发展的紊流区内,同一管路的沿程阻力系数主要与()有关。A.流速 B.流量 C.

题型:单项选择题

问题:

在充分发展的紊流区内,同一管路的沿程阻力系数主要与()有关。

A.流速

B.流量

C.管内壁相对粗糙度

D.雷诺数

考点:中央空调系统操作员考试高级中央空调系统操作员高级中央空调系统操作员题库
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The following four advertisements are from Yangtse Evening News, Mar 8th , 2012.
Guitar lessons
An excellent musician.
Good at teaching kids for 5 years.
Your home or mine.
Call Larry at 86087593.
Taxi driver wanted
Full time.
Experience and good knowledge of the city needed.
Under 45 years old.
Call Mr. White at 75132633 or 13935728866.
Lost dog
Medium size, spotted white short hair.
Answer you when you call it David.
Many thanks for returning it.
Call Susan at 87328059.
Flat for sale
Two bedrooms, a kitchen and a bathroom.
Hot water 8:00—18:00.
Beautiful sights out of the windows.
QQ: 770519666.
Call Ms. Green at 86777555 or 13813913788.
小题1:Which of the four people may get the job as a taxi driver?
A.A 50-year-old person.
B.A 40-year-old person who can drive well in the city.
C.A person who has just got his driver’s license.
D.A person who can drive and has free time on weekends.
小题2:How can you contact (联系) the owner of the flat for more information?
A.By visiting her.B.By sending a letter.
C.By making a phone call.D.By sending an e-mail.
小题3: Who can teach children to play the guitar?
A.Larry.B.David.C.Mr. White.D.Susan.
小题4:When you find a medium-sized dog with spotted white short hair, you may call at_______.
A.86087593B.75132633 C.87328059 D.86777555
小题5:Where are these advertisements from?
A.China Daily.B.New York Times.
C.Yangtse Evening News.D.Jingling Evening News.
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跨期套利指的是利用两种不同的、相互无关联的商品之间的期货合约价格的差异进行交易,以获取利润的交易方式。()

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线性能量传递(linear energy transfer,LET)指的是()。

A.高能射线在单位径迹中心轴上发散的能量

B.每单位径迹中心轴上长度介质吸收的能量

C.每单位径迹中心轴上长度发散的能量

D.单位径迹长度介质吸收的能量

E.以上都不对

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食用香精按照性能分类,可分为()

A.水质香精

B.油质香精

C.乳化香精

D.粉末香精

E.微胶囊香精

题型:单项选择题

焦虑性障碍不包括()

A.惊恐障碍

B.强迫症

C.急性应激反应

D.焦虑反应

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