heptahydrate的音标：heptahydrate的英式发音音标为：[heptə'haɪdreɪt]heptahydrate的美式发音音标为：[heptə'haɪdreɪt]...

The preparation of sulfate heptahydrate and copper sulfate pentahydrate from calcined zincblende was investigated.用经高温煅烧后的闪锌矿石与稀硫酸反应制备七水硫酸锌和五水硫酸铜.Modified polymerized sulphate flocculating agent was made with ferrous sul...

n.七水混合物...