On Sunday Cohen lay around the house all day.科恩星期天一整天都在家无所事事。Injun Joe's bowie - knife lay close by, its blade broken in two.印第安-乔的那把猎刀还在他身边, 刀刃已裂成两半.They did not sell a single car for a month and had to lay off wor...
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...