Tert - octylamine was prepared with di - isobutene and hydrocyanic acid as mine feed. The yield was high.以二异丁烯和氢氰酸为主要原料,高收率地制备叔辛胺.This paper discusses the commercialized production methods of several chemicals using hydr...
She went from place to place, and dug and weeded.她到处走, 又挖土,又锄草.They weeded out useless books from library.他们从图书室里淘汰无用的书.He weeded out one by one the books he didn't want.他把不想要的书一本一本丢掉....
Hydrogen is used extensively in industry for the production of ammonia.氢气在工业上广泛用于制氨。He mobilized public opinion all over the world against hydrogen-bomb tests.他动员全世界的舆论反对氢弹试验。Carbon, hydrogen and oxygen combine chemicall...