间谍活动
发表于 2025-3-23 12:44:43
Basic Concepts,y, meros-part.) In this context, a large molecule is commonly arbitrarily regarded either as one having a molecular weight of at least 1000 or as one containing 100 structural units or more. By a structural unit is meant a relatively simple group of atoms joined by covalent bonds in a specific spati
mediocrity
发表于 2025-3-23 17:44:12
Polyolefins,ule. Polymers derived from unsaturated aromatic hydrocarbons and dienes are considered in later chapters. At the present time the principal commercial polyolefins are polyethylene (polythene), polypropylene, polyisobutene, poly-butene and poly(4-methyl-l-pentene) together with related copolymers. Th
amplitude
发表于 2025-3-23 21:21:41
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Modicum
发表于 2025-3-23 22:21:51
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Offbeat
发表于 2025-3-24 02:22:30
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cluster
发表于 2025-3-24 09:10:12
Aliphatic Polyethers,ain polymer chain. This definition excludes poly(vinyl ether)s, in which the ether groupings are in the side-chains; these polymers are dealt with in Chapter 8. Aromatic polyethers are considered in Chapter 12. Also included in this chapter are furan polymers, which may be regarded as cyclic polyeth
progestogen
发表于 2025-3-24 13:47:29
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confederacy
发表于 2025-3-24 18:13:27
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细菌等
发表于 2025-3-24 22:38:50
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sultry
发表于 2025-3-25 03:13:06
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