at the same school a difficult match from Room 205
i have a good friend called brett how about you
回收利用是保护金属资源的一条有效途径,某工业废料含氧化铜和氧化铁,经过处理后可得到铜和硫酸亚铁溶液.主要流程如图:
已知:CuO+H2SO4═CuSO4+H20 Fe+Fe2(SO4)3═3FeSO4
换位思考、与人为善的实质是( )