The new technology for the preparation of cryolite from fluosilicic acid and ammonium hydrocarbonate is introduced.介绍了氟硅酸、碳酸氢铵制备冰晶石的新工艺.Bites suction cup the toxin and apply 3 % ammonia solution or 5 % sodium hydrocarbon...
...a grizzled old age pensioner...头发花白、靠养老金过活的老人He is already an old man and pensioner, but quite active.他已经是个老年人,领养老金了, 但是精力相当充沛.The tax threshold for a pensioner is $ 6,000.领退休金的人的纳税起点是六千美元.The delighted pensioner walk...
Its main components include propane, butane and butylene.主要成份是丙烷 、 丁烷、丁烯等.Catalytic oligomerization of remain butylene is a way for enterprises to rebottle andpotentialities for more benefits.剩余丁烯催化齐聚是企业消除瓶颈、挖潜增效的途径.By m...