Fire safety英语作文我要

Fire safety英语作文我要
Fire safety英语作文
我要

Fire safety英语作文我要
When did people start to use fire?No one knows,but we know it was a long time ago.Some people say it was about 200,000 years ago.Other people say it was 1,000,000 years ago.Fire was useful then and fire is useful now.Fire was a great thing.It changed our future but fire can aslo be very dangerous.Don't play with fire and when you see a fire.You should be carful.

英语不怎么行

The campus is personnel public gathering places, the height of teaching instruments and equipment, scientific research value of electricity, experiment, practice project and combustible, once the fire...

全部展开

The campus is personnel public gathering places, the height of teaching instruments and equipment, scientific research value of electricity, experiment, practice project and combustible, once the fire accident, great influence, and great losses, directly affects the normal teaching and research work. Therefore, our attention for many years, always put fire control work on campus work on fire prevention work first. Fire prevention campus is a grasping tireless work, students learn knowledge of fire is indispensable in the lesson.
In order to enhance the students' awareness of fire safety, fire safety responsibility for students to learn, fire safety knowledge, we edit the "fire safety knowledge. This book mainly include: the fire extinguisher basic knowledge, basic knowledge, early fire fighting fire evacuation method, and the fire escape knowledge, knowledge interlocution, etc, and collect the campus fire case, fire safety knowledge competition, etc. Its purpose is to let students understand this book, learning through fire safety knowledge, be familiar with the performance characteristics of fire extinguishing, master, evacuation, escape skills, improve the defense self-rescue ability, prevent campus fire. At the same time, also for the vast number of students and students learn and obligatory fire brigade provides information. We hope that, through the study on fire control safety knowledge, make the students do SanDong "three", namely: understand the harmfulness of fire, fire fighting, and understand the fire prevention methods of measures: will quote fire extinguisher, can use, can escape.
"Hidden risks in fire prevention is better than relief, responsibility, than mount tai. We hope our students consciously assume the responsibility and fire control work on campus, more learning and obligation, and observe the master knowledge of fire fire system, actively participate in campus, make our fire control work "all care about fire, fire" of attention to materialize, radically reduce or avoid campus fire accident.
(1) the definition of combustion
Fire, burning, commonly known as the oxidant refers to the role of combustibles away from fire, usually accompanied by exothermic reaction, shine and (or) of smoke.
With three characteristics, namely the burning heat and chemical reaction, shine.
(2) burning conditions
The necessary conditions for the burning of the combustion process - substance and development, must have the following three necessary conditions, namely: combustible, antioxidant and temperature (fire) lead. Only these three conditions occur, and burning phenomenon, no matter what a condition, lack of combustion can occur. But, not the above three conditions exist at the same time, it must happen burning phenomenon, must also be these three factors interact to combustion.
1 who can combustible: with the oxygen in air or other antioxidants on combustion chemistry substance called burnable. According to its physical state into the combustible gas, liquid and solid combustible combustible combustible three categories. Can burn material is mostly hydrogen and carbon compounds, some metals such as aluminum, magnesium and calcium in certain conditions can burn, and many substances such as hydrazine ozone at high temperatures can decompose and released by his light and heat.
2: help and support antioxidant combustible substances, which can burn with combustible substances called oxidation reaction. The combustion process is mainly in the air oxidants such as oxygen free of fluorine, chlorine, such as the reaction can burn.
3 temperature (led) : refers to the source and oxygen supply of fuel combustion burner or reaction energy sources. Common heat energy, there are other, electricity, heat energy transformation, etc.
4 the chain reaction: there exists flame combustion chain reaction. When some burnable heated, it will not only, and the fuel vaporization of molecular occur warm solutions are produced by the action of free radicals. Free radicals are a highly active chemical form, and other radicals and molecular reactions, and make the combustion, it is the ongoing burning chain reactions.
The sufficient conditions for burning, (1) the burnable concentration; certainly (2) some content of oxygen (3) certain ignition energy. (4) by inhibiting the chain reaction. Example: the minimum ignition energy petrol raj 0.2 to 19mJ o., ether, 0.215 methanol as mJ. For before the flame combustion, three conditions exist, interaction, and burn that will happen. But for the flame combustion %

收起

我英语不怎么行

Fire safety
Everyone knows that fire was a great thing. It has changed our lives a lot. Cooking meat on a fire makes it tastier, healthier and safer so people become strong. Fire can make p...

全部展开

Fire safety
Everyone knows that fire was a great thing. It has changed our lives a lot. Cooking meat on a fire makes it tastier, healthier and safer so people become strong. Fire can make people warm and dry. Fire can keep the dangerous animals away at night. But fire can also be very dangerous.
One night in 1666, a baker went to bed after work. He did not put out the fire in his oven. A fire started when he was in bed. First, his shop was on fire, but soon, it was the whole street. The Great Fire of London began. It lasted four days and four nights.
Many people died and injured.
We must be careful with the fire. When you are at home, you mustn''t play with matches，lighters or candles.

收起