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Anonymous users2024-01-24Hello; Asphalt includes four types of asphalt, including natural asphalt, petroleum asphalt, shale asphalt and coal tar asphalt, the main components are asphaltene and resin, followed by high boiling point mineral oil and a small amount of oxygen, sulfur and nitrogen compounds. It is shiny, in a liquid, semi-solid or solid state, brittle at low temperatures, and has good cohesiveness and anti-corrosion properties. Among the four types of asphalt, coal tar asphalt is the most harmful.
In electrode roasting furnaces, impregnation of refractory materials and linoleum production, a large amount of asphalt smoke is discharged. Because the asphalt contains fluorescent substances, including the carcinogen 3,4 benzopyrene, it volatilizes with the flue gas when it is treated at high temperature. Bitumen flue gas is a yellow gas, most of which is micron tar mist particles.
It was determined that the asphalt flue gas discharged from the electrode roasting furnace contained 3,4 benzopyrene as milligrams of cubic meters. Asphalt smoke and dust can cause poisoning through the respiratory tract and polluted skin, causing dermatitis, blurred vision, ocular conjunctivitis, chest tightness, palpitations, headache and other symptoms. It has been scientifically proven that 3,4 benzopyrene contained in bitumen and bitumen smoke is one of the main causes of skin, lung, stomach and esophageal cancers.
The bird's nest is all made by itself, and if you add anything at will, it will make the bird think that its nest is occupied by someone else! Remove the things in the nest and don't touch it often, if the bird doesn't come back within two days, the nest will be considered useless.
This kind of night light using USB power supply has been designed to set a fixed current and service life, and the external side cannot increase the power supply current. Therefore, if you want to increase the current, it will directly short-circuit and burn out and end the service life.
If you're in it, you'll lose a lot of money.
Good looking, not too deep, depending on the light.
You can try to flush the toilet to see if it can be flushed, if the water is flushed out, then you listen carefully to whether the sound of the drainage pipe is very smooth, if the sound of the water is very smooth, it will not be blocked, the current community sewer pipe is much thicker than the pipe of the old house, but if it is blocked, it is also very fast, it is the trouble point, 1 is blocked in the toilet pipe, then you must ask someone to dredge, but the general property has this kind of free service, 2 is blocked in the sewer pipe, Then you have to ask all the residents upstairs can not put water, then open the pipe to get out, now the sewer pipe has a rotating lid, let go of the lid and find something to pull it out, here is also an annoying problem is if you decorate the bathroom with the sewer pipe in the trouble, this has to figure out by yourself, but I still heard for the first time that the underwear fell into the toilet.