The microwave oven 600字高中英语作文

　　People usually think that microwave food is safe. In the United States, more than 90% of households have a microwave oven. Microwave oven is quick and convenient, economical and practical, is the ideal of modern fast rhythm life cooking tools, but the microwave oven has certain harm to human body health.

　　Microwave is very short electromagnetic waves, belongs to the nature part of the energy spectrum. The sun produce microwave, however, produced by the sun produced by microwave has significant difference between microwave and microwave oven. The difference is that the microwave oven is made of alternating current (ac) to generate the microwave.

　　How is the microwave oven cooking food? Alternating current (ac) can produce a high frequency electromagnetic wave, microwave. Water molecules have the positive and negative, so when the water for plus or minus alternate microwave energy, the water molecules will quickly turn. It is a little similar to the pins on the plane with a magnet suck the situation around. Microwave oven with alternating current produced by microwave, the water in the food molecules rotate at a speed of hundreds of millions of times per second, causing tremendous friction between molecules, rapid heating of food.

　　In fact, quality inspection institutions only care about whether there is a microwave microwave leakage. Amazingly, the quality inspection agencies have never questioned the microwave food itself is safe. Stage in 1991, owing to a lawsuit, people begin to realize that the microwave food is not one hundred percent safe. A man named Norma, walter's women's family to Sue her death by mistake.

Sea ray

　　If you can see the sea at night, it was quite magnificent. It like a star point, and as milk a slice of light, like a colorful fireworks. People call this phenomenon as the "sea of fire", this fascinating sight who caused it? Who is the masterpiece?

　　There is a light appeared in the sea voyage and around the stern of a ship under spray foam, this is mainly caused by the particles small luminous plankton. Itself more than a rose red, usually with a fatty substance in the body can put light. Glowing characteristics is by countless white, light green or light red flash. But usually only on the surface of a mechanical disturbance or they are more distinct chemical stimulus. When sea waves push them to gravel coast, they glow is triggered by a larger. Like a beam of light coming from flying sparks, such as "fire rain fall, wave came a wave, the sea luminous type is known as the spark. There is a sea glow is caused by the Marine luminescent bacteria. Their luminous intensity is weak, its characteristic is that whatever sea condition, also no matter whether the outside disturbance, as long as the luminescent bacteria exist in great quantities, the surface will appear a milky glow. Such bacteria in estuary, bay, cold warm, especially the sewer) the most polluted places, such as sea glow called diffuse light.

　　Another sea glow is caused by the ocean body larger glitter, such as jellyfish, sponge, moss bug, ring and pest etc. Jellyfish glow on body have special organs, stimulated a large flash, some fish can produce a kind of special material, the material and oxygen effect and shine. This light is usually isolated, in machinery, chemistry, just stick out, they make the sea ray characteristic is a bright one dark, repeated cycle, like a flash, the sea luminous type is known as the flash light.