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Anonymous users2024-01-24A oil is a high-grade fatty acid glyceride, which is hydrolyzed in alkaline solution to produce sodium and glycerol of high-grade fatty acids, which is soluble in water and easy to wash, so A is correct;
B Iodine and iron are essential trace elements for the human body, so eating iodized salt and iron-fortified soy sauce can supplement the trace elements of the human body, so B is correct;
C Formaldehyde can denature proteins, so although formaldehyde solution can kill bacteria, formaldehyde is a toxic substance that is harmful to the human body, so it is not suitable to soak seafood, so C is correct;
D Food additives can improve the color and flavor of food, prolong the shelf life of food, can be added and used according to law, can not be used in excess, so D is wrong;
So choose D
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Anonymous users2024-01-23A oil is a high-grade fatty acid glyceride, which is hydrolyzed in alkaline solution to produce sodium and glycerol of high-grade fatty acids, which is soluble in water and easy to wash, so A is correct;
B. After the tinning iron drum plating is damaged, the galvanic cell is formed in the electrolyte solution, and the iron is used as the negative electrode, which is easy to be corroded; After the galvanized iron barrel coating is damaged, a galvanic cell is formed in the electrolyte, and the positive electrode of the galvanic cell is protected by iron, so the tinned iron drum is more likely to be corroded, so B is correct;
C. After wiping the skin with alcohol, the corresponding part has a cool feeling because the alcohol is volatile and takes away the heat, and it has the ability to disinfect and sterilize because 75% of the alcohol solution coagulates the proteins that constitute the basis of bacterial life, so C is wrong;
D. The protein of the bacteria is denatured and dies by heating, so D is correct;
So choose C
A. One water is used for multiple purposes, which can save water resources, correct >>>More
LPG is stored under pressure, and your answer is D, there is white gas above the broth, and that is not water vaporization, but small water droplets formed by the liquefaction of water vapor when it is cold, and it looks like a piece of white gas.
A mistake: After washing the oil stain with the detergent, it cannot form a real solution, but only an emulsion. It is an oil-water emulsion.
The main feature of the ecological toilet is that there is a biogas digester underground, and the principle is that there are a lot of organic matter in the human feces and urine in the biogas tank, which can be used by bacteria, in an oxygen-free environment, some methanobacter and other bacteria decompose these substances through fermentation to produce methane, which can be burned for lighting, heating, etc., which is a clean energy, and at the same time releases energy to produce high temperature, which can kill various germs and insect eggs in human feces and urineEcological toilets can not only reduce the pollution of human feces to the environment, but also produce biogas, which is a kind of clean energy residue and residual liquid can be an excellent fertilizer; The roof of the ecological toilet can be covered with soil and planted, and it can be seen that BD is in line with the theme >>>More
A. Sucrose has a sweet taste, salt has a salty taste, and the taste can be distinguished, so A is correct; >>>More