问题
选择题
Those are my three cousins. of them are interested in soap operas. [ ]
A.Each
B.All
C.Both
D.One
答案
答案:B
Those are my three cousins. of them are interested in soap operas. [ ]
A.Each
B.All
C.Both
D.One
答案:B
你认为下列实验方案中,要将待提纯的物质中杂质(括号内为杂质)除去,下表中选用的试剂及操作方法均正确的一组是( )
选项 | 待提纯物质 | 选用试剂 | 操作方法 |
A | CuCl2(MgCl2) | 镁片 | 过滤 |
B | CaO(CaCO3) | 盐酸 | 蒸发 |
C | Cu(Fe) | 稀硫酸 | 过滤 |
D | FeCl3溶液(盐酸) | 氢氧化钠溶液 | 滴加 |
A.CuCl2(MgCl2)
B.CaO(CaCO3)
C.Cu(Fe)
D.FeCl3溶液(盐酸)