问题 问答题 简答题

计算题:计算CIP洗涤液的配制量

某糖化车间CIP系统碱槽有效容量为8KL,液位计显示容量6.3KL,经分析碱液浓度为0.85%,需补加碱和水,配制成碱液浓度应为2%(m/v)的满罐碱液,请计算需补加95%(m/m)的固体碱或有效浓度为40%(m/v)的液体碱各多少?

答案

参考答案:

解:按有效容量需补加液体=8-6.3=1.7(KL)

需补加碱=1.7×1000×2%=34.00(kg)

另剩余容量的浓度差=2%-0.85%=1.15%

需补加碱=6.3×1000×1.15%=72.45(kg)

补加碱总量=34.00+72.45=106.45(kg)

补加固体碱=106.45÷95%=112.05(kg)

补加液体碱=106.45÷40%=266.13(kg)

需补加95%(m/m)的固体碱112.05kg或有效浓度为40%(m/v)的液体碱266.13kg。

阅读理解

阅读理解。

     Why do we need to throw less away? There are two reasons. One is that some resources (资源) are

nonrenewable (不可再生的) That means there is only a certain amount of that resource in the world .

One example of this is oil. When we use up all the oil in the world, there will be no more.

     There is another reason for throwing less away. All of our trash has to be put somewhere. Often , it is

put into garbage dumps (垃圾场). Much of that trash will be there for hundreds of years. The dumps will

be filled up with all this trash.

     There are three ways to cut down on trash.

     One way is to recycle. When you recycle something, it means it is made into another shape and used

again. Old newspaper may become paper bags. A glass jar can be melted(熔化)and made into a bottle .

     Another way to cut down on trash is to reuse things. You can wash and use again a bottle that can hold mustard (芥末酱)or something else .

     The third way to cut down on trash is to reduce the amount of trash you make, stop buying thing that

you don't need in the first place. That reduce the amount of the earth's resources that you use.

1. How many reasons do we need to throw less away?

A. Three

B. five

C. two

2. When you reuse something, it means ________.

A. it is made into another shape and used again

B. it is used again

C. it isn't used any more

3. All the ways of cutting down on trash in the passage are to________ .

A. recycle and reuse things

B. recycles and reduce the amount of trash you make

C. reuse things recycle and reduce the amount of trash you make

4. If a broken plastic box is changed into a plastic ruler , the way is to________ .

A. recycle

B. reuse

C. reduce

5. The word "reduce" in the passage means________.

A. 还原

B. 减少

C. 增加

问答题 论述题