通用汽车公司以大约4亿美元的价格购得了萨博汽车公司50%的股份。General Motors acquired a 50% stake in Saab for about $400m.在大多数情况下，土地都是由其使用者购得。Land is, in most instances, purchased by those who occupy it.大部分的股份是从经纪人手中购得的。Most of those shares were purc...
缔和聚合物较 非 缔合聚合物而言是一种比较好的酸液稠化剂.Association polymer than the non - associated polymer is a relatively good acid viscosifier.通过对稠化剂和抗磨添加剂的筛选,研究以水为分散介质的润滑脂.Lubricating greases with water as dispersing media are studied by scr...