问题 问答题 论述题

有安全气囊就一定安全吗?为什么?

答案

参考答案:

当然不是,许多情况下撞车后气囊并没有爆开,当然并不是安全气囊存在问题,因为正常的安全气囊启爆是需要碰撞满足一定条件的。在一些交通事故中,虽然车内乘员碰得头破血流,甚至出现生命危险,车辆接近报废,但是如果达不到安全气囊的爆炸条件,气囊还是不会打开。 

以下情况安全气囊可能不会启爆:与静止的同等重量的车正面撞击时,即使车速达到要求,但是气囊可能不会启爆。撞击方向以及撞击点偏离车辆中心时;与树木、简易护栏等容易变形的物体碰撞时;小型车辆与大型车辆的后部追尾(钻入)时;乘员室以外的其他车身部位受到侧面撞击或斜向撞击时另外,以下情况安全气囊有可能启爆: 

以一定的速度正面撞击不移动、不变形的墙壁;以一定的速度正面撞击不移动、不变形的柱状物体;行驶中车辆的底部受到强烈撞击。 

因为安全气囊起爆时会以非常快的速度迅速膨胀,所以乘员在与安全气囊接触时,可能会造成伤害。因此在驾驶或乘坐装备安全气囊的车辆时必须调好座椅位置,正确系好安全带,安全带要系于肩部,尽可能的低于腰椎。孕妇、幼小的儿童和抱小孩的乘客严禁坐在副驾驶的位置,要坐在后排座椅上。对于幼小的儿童,可使用汽车儿童座椅,将儿童座椅固定在后座椅上,并为其系好安全带。

阅读理解

阅读理解。

     Man is a land animal, but he is also closely tied to the sea. Throughout history the sea has served the needs

of man. The sea has provided man with food and a convenient (便利的) way to travel to many parts of the

world. Today, nearly two thirds of the world's population live within 80 kilometers of the sea coast.

     In the modern technological world, the sea offers many resources to help mankind survive (=continue to

live). Resources on land are beginning to be used up. The sea, however, still can be hoped to supply many of

man's needs.

     The list of riches of the sea yet to be developed by man's technology is impressive. Oil and gas explorations

(探险) have been carried out for nearly 30 years. Valuable amounts of minerals exist on the ocean floor ready

to be mined (开采).

     Fish farming promises to be a good way to produce large quantities of food. The culture of fish and shellfish

(贝类动物) is an ancient skill practised in. the past mainly by Oriental people.

     Besides oil and gas, the sea may offer new sources of energy. Experts believe that the warm temperature

of the ocean can be used in a way similar to the steam in a steamship. Ocean currents (水流) and waves offer

possible use as a source of energy.

     Technology is enabling man to explore (勘探) ever more deeply under the sea. The development of strong,

new materials has made this possible.

     The technology to harvest the sea continues to improve. Experts believe that by the year 2020 the problems

that prevent us from exploiting fully the food, minerals, and energy sources of the sea will be largely solved.

1. The major things that the sea offers man are ____.

A. fish and oil

B. minerals and oil

C. warm temperature and ocean currents

D. the food, energy sources, and minerals

2. We can conclude from this passage that ____.

A. the sea resources have largely been used up

B. the sea, in the broad sense, has not yet been developed

C. the problems that prevent us from using the food, minerals, and energy sources of the sea have already been solved

D. by the year 2000, the technology will be good enough to exploit all the sea resources

3. The best title for this passage is ____.

A. Sea Harvest

B. Sea Food

C. Technology for Exploiting the Sea

D. Man and the Sea

单项选择题