问题 问答题 简答题

中央空调系统由哪些部分组成?

答案

参考答案:

冷冻主机、冷却塔、冷冻水循环系统、冷却水循环系统、冷却风机

阅读理解与欣赏

深层海水的利用

       ①众所周知,海洋中有着丰富的生物和矿产资源,殊不知海水本身也是海洋宝藏之一。海洋学家在长期的研究中发现,深层海水是海洋的精华。若能充分利用深层海水,将会使人类受益无穷。

       ②所谓深层海水,是指海洋深处的海水。深层海水大量存在于距陆地5000米以外、水深200米以下的地方。在这样的深处,光合作用无法进行,有机物分解的速度远远高于其合成速度,使作为“肥料”的氮、磷、钾等微量元素大都被保存下来,因此它的营养十分丰富,这就为深层海水的利用提供了条件。

       ③同时,深层海水受海底地形及气象条件的影响,会自然涌升到海面上来。在茫茫大海上,这种被称为“涌升海面”的地方仅占全球海洋面积的0.1%,但却集中了海洋鱼类资源的60%,甚至更多。其奥秘就隐藏在深层海水里:当含有丰富微量元素的深层海水涌上海面后,浮游生物和藻类得以更快生长,为鱼类提供了丰饶的“肥料”。研究表明,涌升海域和一般海域在鱼类产量上的差距极为惊人,单位面积涌升海域的鱼类生产量是沿岸海域的上百倍,是外洋海域的数万倍。如果人类能制造“涌升海面”,将使深层海水资源得到充分的利用,很可能给海洋渔业带来一场深刻的革命。

       ④深层海水还是一种几乎没有被污染的水,病菌极少。深层海水营养盐浓度是表层海水的5倍,而细菌含量却只有表层海水的1/10甚至1/100。

       ⑤深层海水在医学领域开始有了用武之地,它已成为一种奇妙的“绿色药品”。医生们用深层海水治疗先天过敏性皮炎,只要在患处涂上深层海水,患者的症状就会得到缓解。据统计,使用深层海水进行治疗的患者,约有60%收到了良好的疗效。不过,医生们尚不清楚究竟是深层海水中的什么成分在治疗中发挥了作用。

       ⑥洁净的深层海水还引起了食品和化妆品生产厂家的极大兴趣。利用深层海水来生产豆腐;酱油、咸菜等,不仅发酵过程加快,而且口感更好。这类产品受到了消费者的青睐,在市场上十分畅销。有些化妆品生产厂家也跃跃欲试,计划利用深层海水开发新一代化妆用品。

       ⑦深层海水每时每刻都在进行着蔚为壮观的大循环,这种大循环使海洋充满了活力。

       ⑧生生不息的深层海水给21世纪的人类带来了新的机遇。

1.选文运用了怎样的说明顺序?

                                                                                                                

2.第③段中与词“丰饶”意思相近的词语是                ,划线词“肥料”在文中的意思是

                              。

3.第④段的画线句运用了哪种的说明方法?其作用是什么?

                                                                                                                

4.阅读全文,深层海水有哪些特点?

                                                                                                                

5.下面句子中划线的字能否去掉?为什么?

      据统计,使用深层海水进行治疗的患者,有60%收到了良好的疗效。

                                                                                                                

6.文章结尾说“生生不息的深层海水给21世纪的人类带来了新的机遇”,通读全文回答,深层海水给21世纪的人类带来了哪些新的机遇?

                                                                                                               

7.根据文意,下列理解错误的一项是[ ]

     A.海洋宝藏包括丰富的生物、矿产及深层海水等资源。

     B.人工制造“涌升海面”是为了充分利用深层海水资源。

     C.深层海水中无法进行光合作用,微量元素都被保存下来。

     D.单位面积涌升海域的鱼类生产量是外洋海域的数万倍。

阅读理解

Sometimes people call each other "freaked-cat", but have you ever thought about this expression? When a cat is frightened, its heart starts beating faster, its muscles get tense, and there are changes in the chemicals in its bloodstream.Although the cat doesn't realize this, its body is getting ready for action.If the danger continues, the animal will do one of two things.It will defend itself, or it will run away as fast as it can.

Something like this also happens to people.When we are excited, angry, scared, or aroused by other emotions (feelings), our bodies go through many physical changes.Our hearts beat faster, and our muscles get tense.All of these changes make us more alert and ready to react.We, too.get ready to defend ourselves or run.

Human beings, however, have a problem that animals never face.If we give way to our feelings and let them take over, we can get into trouble.Have you ever said something in anger —or hit somebody—and regretted it later? Have you ever shouted at a teacher, told somebody you were lonely, or said you were in love, and then wished later you had kept your mouth shut?

It isn't always clever to express your feelings freely.

Does this mean that it's smarter always to hide our feelings? No! If you keep feelings of anger, sadness, and bitterness hidden away or bottled up inside, your body stays tense.Physical illness can develop.It can actually be bad for your health.(It isn't good to keep pleasant feelings inside either; all feelings need to be expressed.)

Feelings that you keep all bottled up inside don't just go away.It's as if you bought some bananas and stuck them in a cupboard.You might not be able to see them.but before long you' d smell them.And if you opened the cupboard, chances are that you'd see little fruit flies flying all over them.They'd be rotten.

You can try to treat emotions as if they were bananas in the cupboard.You can hide them and you can pretend they don't exist, but they'll still be around.And at last you'll have to deal with them.just like those bananas.

小题1:The best title for this article is_____.

A.Emotions Affect Our Bodies

B.What Happens to A Frightened Cat

C.What Happens to An Excited Person

D.Feelings That People Have小题2:What does the word "freaked" mean in the first sentence?

A.excited

B.scared

C.angry

D.shocked小题3:According to the passage, we may conclude that we human beings_____.

A.have fewer problems than animals

B.have the same problems as animals

C.have more problems than animals

D.have cleverer problems than animals小题4:If you hold in your feelings,_____.

A.gradually they'll disappear

B.they won't exist any more

C.they will fly all over

D.your body stays tense小题5:The author wrote this article in order to_____.

A.tell us that it isn't good to keep feelings inside

B.give us some advice on how to express our feelings

C.make us face the problem that we have to deal with feelings

D.make us know that it isn't always wise to express our feelings freely