问题 问答题 简答题

开场时码头具有哪些特点,在我国发展前景如何?

答案

参考答案:

特点:

1.码头前沿水深、波浪大,要求码头面高程高,使码头顶面不被淹没和满足上部结构受力的限制;

2.系泊船舶在波浪作用下对码头的撞击力往往是码头的主要水平荷载,码头结构承受较大的波浪和海流共同作用的动力荷载,需配备大拉力的系缆结构和吸能好的大型护舷;

3.为适应恶劣施工条件、荷载的动力性质和使用要求,宜选用装配程度高、弹性好和波浪反射较轻的结构。

发展前景:

开敞式码头的建设在我国是从20世纪70年代初开始,最早是在秦皇岛油码头一期工程采用的。此后相继建成了一系列开敞式码头,其中多数为油码头、矿石码头和煤码头,也有集装箱码头。

阅读理解

阅读理解

       Germs(细菌 ) are everywhere. You can't see them, but they are on your desk,on your computer,

and even in the air !

       Like people,germs move around the world. They fly with us on planes. When food, clothes, and

other things travel around the world,germs travel,too. Some germs are safe,but some are dangerous.

Germs cause illnesses like colds and the flu.

Warmer Weather Brings Germs

       The world's weather is changing. Cooler countries are getting warmer, so insects from hot countries

can move there. Some of these insects,like mosquitoes,carry dangerous germs. These germs cause

headaches, fever, and can even kill people.

Under Your Skin

       Your skin protects you from germs. It stops some germs,but not all. They can enter your body when

you eat,or when you have a cut. Germs are on your hands, too. They enter your body when you touch

your eyes, nose , or  mouth.

Fighting Germs

       Your immune system(兔疫系统) protects you, too. When germs get inside your body,your immune

system finds and kills them. Special cells (细胞) move around your body and fight germs. They help you

stay healthy. Other cells make antibodies. Antibodies help your body

find and stop germs.

       What can you do to fight germs? You should wash your hands with soap and water. Soap kills many germs, and water washes them away.

1. According to the text,insects                  .

A. kill germs      

B. carry germs      

C. protect germs    

D.love germs

2. The underlined word "there" refers to                    .

A. cooler countries  

B. hot countries    

C. everywhere      

D. the world

3. Which of the following is RIGHT according to the text ?

A. All germs are dangerous.      

B. There are more germs in cold places.

C. Soap can kill all germs.      

D. Germs can get into your body.

4. What do antibodies do?

A. They kill germs and wash them away.    

B. They find and develop germs.

C. They help protect us from germs.        

D. They carry dangerous germs.

5. Which can be the best title for this text?

A. Germs Are Everywhere                

B. Weather Is Changing

C. Skin Stops Germs                    

D. Germs Are Developed

单项选择题