nonchalance
发表于 2025-4-1 03:09:27
http://reply.papertrans.cn/89/8827/882664/882664_61.png
可转变
发表于 2025-4-1 06:39:45
Fibers,he pioneering work of W. Carothers at Du Pont synthesizing the nylons in 1929–30. Commercialization occurred in 1938. Polyesters were made by Whinfield and Dixon in the U.K. in 1941. They were commercialized in 1950.
noxious
发表于 2025-4-1 10:51:58
Chemicals from Limestone,p 50 that are derived from limestone. Since lime is the highest-ranking derivative of limestone in terms of total amount produced, we discuss it first. Refer to Fig. 2.1, Chapter 2, Section 1, for a diagram of limestone derivatives.
Thrombolysis
发表于 2025-4-1 17:29:55
http://reply.papertrans.cn/89/8827/882664/882664_64.png
树上结蜜糖
发表于 2025-4-1 21:31:43
Basic Organic Chemicals,e C. fraction are all made by steam (thermal) cracking of hydrocarbons. Benzene, toluene, and the xylenes are made by catalytic reforming. Just how significant are these seven basic organics? Nearly all organic chemicals and polymers are derived from them.