什么是浮阀板的液面落差?

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问题:

什么是浮阀板的液面落差?

考点:气体分馏装置操作工中级气体分馏装置操作工中级气体分馏装置操作工题库
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下列有关盐类水解的说法不正确的是()

A.盐类的水解过程破坏了纯水的电离平衡

B.盐类的水解是酸碱中和反应的逆反应

C.盐类水解的结果使盐溶液不一定显中性

D.Na2CO3溶液中c(Na)是c()的2倍

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阅读理解。

     Reading to dogs is an unusual way to help children improve their literacy skills.  With their shining

brown eyes, wagging tails, and unconditional love, dogs can provide the nonjudgmental listeners needed

for a beginning reader to gain confidence, according to Intermountain Therapy Animals (ITA) in Salt

Lake City.  The group says it is the first program in the country to use dogs to help develop literacy in

children, with the introduction of Reading Edueation Assistance Dogs(READ).  

    The Salt Lake City Public Library is sold on the idea.  "Literacy specialists admit that children who

read below the level of their fellow pupils are often afraid of reading aloud in a group, often have lower

self-respect, and regard reading as a headache," said Lisa Myron, manager of the children's department.  

    Last November, the two groups started "Dog Day Afternoon" in the children's department of the main

library.  About 25 children attended each of the four Saturday-afternoon classes, reading for half an

hour.  Those who attended three of the four classes received a "pawgraphed" book at the last class.  

    The program was so successful that the library plans to repeat it in April, according to Dana

Thumpowsky, public relations manager.  

1.  What is mainly discussed in the text?   

A.  Children's reading difficulties.    

B.  Advantages of raising dogs.  

C.  Service in public library.        

D.  A special reading program.  

2.  Specialists use dogs to listen to children reading because they think _________.   

A.  dogs are young children's best friends

B.  children can play with dogs while reading

C.  dogs can provide encouragement for shy children

D.  children and dogs understand each other

3.  By saying "The Salt Lake City Public Library is sold on the idea", the writer means the

     library ________.   

A.  uses dogs to attract children    

B.  accepts the idea put forward by ITA

C.  has opened a children's department    

D.  has decided to train some dogs

4.  A "pawgraphed" book is most probably_________.  

A.  a book used in Saturday classes  

B.  a book written by the children

C.  a prize for the children        

D.  a gift from parents

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安全监控设备布置图应标明:()。

A、标明中心站、电源、分站、传感器、断电控制器、声光报警器等设备的位置

B、标明接线情况

C、标明断电范围、报警值、断电值、复电值等情况

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清明节一般是在每年阳历的()之间。

A.四月一日至三日

B.四月四日至六日

C.四月七日至九日

D..四月十日至十二日

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采煤工作面两巷文明生产环境的具体要求是什么?

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