本文报道了用菱锌矿作原料,制备硫酸锌的工艺条件.The technological conditions of the preparation of zinc sulfate with smithsonite as raw materials was reported.研究了以菱锌矿为原料通过酸浸、除杂、中和、沉淀、干燥制备碱式碳酸锌和活性氧化锌的生产工艺.A process for the production of basic zi...
...this mellow Cotswold manor house.这座古色古香的科茨沃尔德庄园宅邸His destination was Chobham Common, a long way from his Cotswold home...他的目的地是乔伯姆公地,那里和他在科茨沃尔德的家离得很远。The Thames rises in the Cotswold Hills.泰晤士河发源于科茨沃尔德丘陵.His destinati...