回流比是塔顶回流量与()或进料量之比。

题型:填空题

问题:

回流比是塔顶回流量与()或进料量之比。

考点:蒸馏工考试初级蒸馏工初级蒸馏工题库
题型:填空题

阅读理解。

     Each year several thousand people are killed on the road in Great Britain. Every year between one and

  two hundred thousand people are injured, or killed in road accidents.

     If you are in England and if you listen to the eight o'clock news from BBC, you will often hear news of

 road accidents. You may hear something like this" On last Monday evening, at about twenty minutes to

 ten, a cyclist was knocked down by a truck at crossing of Oak Road and High Street in Croydon. The

 cyclist has died from his injuries. Anyone who saw the accident please communicate (联系) with New

 Scotland Yard, telephone number Whitehall one, two, one, two. "

     Accidents are often caused by carelessness. If everybody obeys the rules, the roads will be much safer.

 How can we make the road safer?

     In Breat Britain traffic: keeps on to the left. Motor-cars, trucks, buses and cyclists must all keep to the

 left side of the road. In most other countries traffic keeps to the right.

     Before crossing the road, stop and look both ways. Look right, look left again. Then, if  you are sure

 that the road is clear, that there is nothing coming, it is safe to cross the road. If you see small children, or

  very old people, or blind people, waiting to cross the road, it is kind act to help them to cross the road in

  safety.

     We must teach young children to cross the road safely. We must always give them a good example.

 Small children mustn't play in the street.

1. How many people are injured on the road in Great Britain every year?

    A. Several thousand.

    B. Between one and two hundred people.

    C. Between 100,000 and 200,000 people.

    D. Between l,000 and 2,000 people.

2. New Scotland Yard " may be _____.

    A. the police                  

    B. a factory mending cars

    C. a big hospital                

    D. a group saving people from road accidents

3. "In Great Britain traffic keeps to the left" means _____ .

    A. all the cars, buses coming and going along the road must be driven along the left side of the road

    B. all the cars, buses coming and going along the road must be driven to the left side of the road

    C. only trucks must be driven along the right side of the road

    D. all the cars buses coming and going along the road must be stopped on the left side of the road

4. In our country traffic should keep _____.

    A. to the left    

    B. in the right    

    C. on the left    

    D. to the right

5. Which of the following is RIGHT?

    A. Every road accident is caused by carelessness.

    B. "The road is clear means "There's nothing on it."

    C. Before crossing the road in China, you should look left first and then look right.

    D. People can play in the street except small children.

题型:填空题

电磁打点计时器使用的电源是______电源,通常的工作电压为______V以下,实验室使用的是我国的民用电,因此电磁打点计时器的打点间隔时间为______S.

题型:填空题
an=
n
n2+156
(n∈N*)
,则数列{an}的最大项是第______项.
题型:填空题

级配砾石可用于()。

A.高级公路沥青混凝土路面的基层

B.高速公路水泥混凝土路面的基层

C.一级公路沥青混凝土路面的基层

D.各级沥青碎石路面的基层

题型:填空题

档案的性质包括()

A、原始记录性

B、知识性

C、中介性

D、原始性

E、回溯性

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