Several questions on the identification of occupational hazard factors

It’s so sad; the post has been up for 6 days now and no fellow sailors have replied. Did I post it in the wrong section?

A//, C//, C//

Answer from the process area *nht1: @*nht1 1, A 2, AD 3, AB

Question three seems to be C. After checking some information, I found that workshops where mercury is handled should generally be built in a multi-story, single-row layout with monolithic cast-in-place floor slabs. Its indoor walls, ceilings, floors, and other internal structures should be made of dense materials that do not absorb mercury, with an epoxy resin or polyvinyl chloride coating applied to their outer surfaces for protection ； The ground should slope from the center to the sides at a rate of 1–1.5%, and open ditches together with sewage pipes and mercury collection tanks (trays) connected to them should be installed on the side of the walls.

For the first question, option A is the correct choice; there should be no disagreement on that. Coating involves spraying paint, and paint usually contains benzene compounds. Ammonia is used in processes such as neutralization and absorption, as well as in the formation of ammonium salts and ammonia water. Saponification is another process in which ammonia is involved. I’ve never heard of \"acid ethyl ester\" – could it refer to ethyl acetate? As for gasoline, it goes without saying that it’s not relevant here. Regarding the second question separately, the term used in the cement industry for this process is \"calcination,\" and it depends on the type of fuel used; fossil fuels are commonly employed, such as coal. The incomplete combustion of coal produces CO, and CO is also generated when carbonates decompose and release CO2. Coal contains sulfur, which leads to the formation of SO2, as well as nitrogen oxides, which are present in large amounts in vehicle exhaust. In cases where water gas is used for heating, CO is again produced. The process of making bricks and tiles is called \"sintering,\" and just like in the case of cement, it depends on the type of fuel used. For the third question, refer to the detailed explanation provided on floor 5

The formation of nitrogen oxides from nitrogen and oxygen generally requires a considerable amount of energy; the bond energies in nitrogen trinitride are high, as is the case with lightning and vehicle exhaust

Answer order: A A C

Thank you so much; I’ve finally found the correct answer. Corrosion protection and a smooth, sloped floor are definitely necessary choices; I’m not sure whether moisture resistance is also required. Also, could you tell me which standard or specification the information you referred to comes from?

Thank you for your professional explanation on bricks, tiles, and cement. In the painting workshop, benzene, toluene, xylene, and ethyl acetate are definitely used; there are dozens of solvents used in paints, and ethyl acetate is one of them. It has not been decided yet whether gasoline counts as such; the instructors who provide pre-exam training on occupational health are divided on this matter, as the name listed in the catalog of occupational hazards is “gasoline,” while the occupational exposure limit refers to “solvent gasoline,” and it is solvent gasoline that is used as a solvent in paints... I will share the correct answer with everyone once it’s known!

You’re welcome, I’ve learned it too! Source: “Notice from the Ministry of Labor, the Ministry of Light Industry, **the Medical Administration Bureau, and the Ministry of Machinery and Electronics on the Issuance of Regulations on Preventing Poisoning in the Production of Mercury Thermometers” Notice from the Ministry of Labor, the Ministry of Light Industry, **the Medical Administration Bureau, and the Ministry of Machinery and Electronics on the Issuance of Regulations on Preventing Poisoning in the Production of Mercury Thermometers http://www.chinalawedu.com/falvfagui/fg23051/35104.shtml