简述宗法制的定义。

休克2期（）。

A．少灌少流，灌少于流

B．低排高阻型休克

C．低排低阻型休克

D．诱发DIC

E．皮肤发凉加重，发绀，可能出现花斑

阅读理解

      Water is very important to living things. Without water there can be no life on the earth. All animals

and plants need water. Man also needs water. We need water to drink, to cook our food and to clean

ourselves. Water is needed in offices, factories and schools. Water is needed everywhere.

      There is water in seas, rivers and lakes. Water is found almost everywhere. Even in the desert part

of the world, there is some water in the air. You can not see or feel it when it is a part of the air. The

water in the seas, rivers and lakes is a liquid, the water in the air is a gas, and we call it water vapor (蒸气).

      Clouds are made of water. They may be made of very small drops of water. They may also be made

of snow crystals(结晶体). Snow crystals are very small crystals of ice. Ice is frozen water. It is a solid.

There can be snow and ice everywhere in winter.

     Water may be a solid or a liquid or a gas. When it is a solid, it may be as hard as a stone. When it is

a liquid, you can drink it. When it is a gas, you can not see or feel it.

1. Where can we find water?

A. We can find water when it turns into vapor.

B. Water can be found almost everywhere.

C. We can see water in deserts here and there.

D. Water is only in seas and rivers.

2. We can drink water when it is____.

A. a liquid  

B. a solid  

C. in the air  

D. turned into ice

3. Clouds are made of

A. seas, rivers and lakes      

B. blocks of ice

C. very small drops of water or snow crystals

D. solid, liquid and gas

4. Water has three states(状态). They are ____.

A. ice, snow and air    

B. solid, vapor, snow

C. drops of water, blocks of ice and crystals of water

D. solid, liquid and gas

试举一例说明基因工程包括哪几个主要内容或步骤？

八旋翼相对四旋翼，其主要优势在于（）。

A.续航时间

B.操控手感

C.动力冗余

D.辨别方向

台背填土的长度，不得小于规范规定，即台身顶面处不小于桥台高度加2m，底面不小于（）；拱桥台背填土长度不应小于台高的（）倍。

A.2m

B.3m

C.3-4