问题 问答题 简答题

纯真空灌装与重力真空灌装有何异同?

答案

参考答案:

纯真空灌装即真空压力灌装,真空度一般保持在6-7kPa,纯真空包装速度高,但有溢流和回流现象,使液体物料往复循环,且能耗较多,灌装结构复杂,管路清理困难。重力真空灌装即真空等压灌装,是低真空(10-16kPA.下的重力灌装,它消除了纯真空灌装产生的溢流和回流现象适用于蒸馏酒精,白酒,葡萄酒的灌装。两种包装方式都是先将包装容器抽真空后,再将液体物料灌入包装容器内。

阅读理解

There are some easy things you can do to protect(保护) the environment and the earth. Choose ideas from the list or come up with a few of your own.

● Plant flowers, grass or trees.

●Whenever you visit a park or beach, take away what you bring there----keep rubbish in a bag until you can put it in a dustbin (垃圾箱).

●Turn off the lights, TV sets when you leave the room. This saves (节约)a lot of electricity.

●Turn off the tap (水笼头)when you brush your teeth. You can save some water by not letting it run. Also, use a glass cup instead of a paper cup because this saves paper.

●Keep the doors and windows closed in winter to keep warm air in.

●Give your old books and magazines to a library instead of throwing them away.

●Give your old clothes to poor children you know instead of throwing them away.

●Use both sides of paper.

●Stop pouring (倒)dirty water into the rivers or the lakes nearby (附近).

●Encourage all your friends to do the same things you do to help protect the earth.

You don’t have to wait until Earth Day to do these things. Make every day Earth Day.

If everyone makes a contribution (贡献)to protecting the environment, the world will become much more beautiful.

小题1:From the above, we know that this is ____________.

A.a sign

B.a notice

C.an advertisement

D.a proposal (提议)小题2:The writer tells us _____________.

A.to throw rubbish into a dustbin

B.to pour dirty water into the river

C.to save water by letting it run while we are brushing our teeth

D.that we can’t do all these things until Earth Day小题3:We can ___________to save paper.

A.use a paper cup

B.use both sides of paper

C.give old books to a library

D.pick up waste paper at school小题4:Which of the following is WRONG according to the writer?

A.Turn off the lights when you leave the room.

B.Close the doors in winter.

C.Use a paper cup when you brush your teeth.

D.Give your old clothes to the poor children.小题5:The main idea of this passage is how to _________.

A.save money

B.save water and electricity

C.make better use of old things

D.protect the earth

选择题