虚度
发表于 2025-3-23 12:03:18
Volatile Aromatics,ns from underground deposits. The occurrence of these products in the environment is thus mainly or exclusively of man-made origin, as distinct from other hydrocarbons such as methane, terpenoids, polycyclic aromatics.
Hiatus
发表于 2025-3-23 14:03:48
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Immobilize
发表于 2025-3-23 18:01:01
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极小量
发表于 2025-3-23 22:59:33
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hallow
发表于 2025-3-24 02:51:25
Lead, as those for any other pollutant. Because of the ease with which lead is mined and smelted, it was one of the first metals used by early man. Lead was used for glazing pottery, and making ornaments by the Egyptians in 7,000–5,000 BC. The Romans used lead pots for cooking, lead salts for sweeteners,
IST
发表于 2025-3-24 09:46:52
Arsenic, Beryllium, Selenium and Vanadium,m) have received a large share of researchers’ attention. The environmental chemistry of the transition metals, e.g., chromium, nickel, manganese, cobalt, copper, etc., has also been investigated principally because of their roles in metabolism, especially enzymatic processes. However, two non-metal
异端邪说下
发表于 2025-3-24 13:58:41
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生命
发表于 2025-3-24 15:49:11
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gimmick
发表于 2025-3-24 20:09:38
Volatile Aromatics,alene, 1-methyl-naphthalene, 2-methyl-naphthalene, 2,6-dimethyl-naphthalene, and 2,6diisopropyl naphthalene are the most important volatile aromatics of commercial significance. These compounds do not occur in the environment naturally except as constituents of petroleum which may seep into the ocea
饶舌的人
发表于 2025-3-24 23:47:54
Surfactants,d urine. Natural cleaning agents, such as soapwort, horse chestnut, wood ash and the like, were used until the Middle Ages. In parallel, soap developed as a very ancient chemical product, from origins which go back to the Sumerians and to Egypt. In the Euphrates and Tigris area, clay tablets have be