【简答题】Further, natural dyes tended to be ______in ______and ______quickly. It was against this ______that Perkin's discovery was made.
【单选题】在醋酸—醋酸钠缓冲溶液中,起抵制外加酸作用的是( )
【单选题】Natural disasters further raised people’s of environmental protection.
【单选题】在pH=5.0的醋酸缓冲液中用0.002 mol/L的 EDTA 滴定同浓度的Pb2+。已知: lgK(PbY)=18.0, lgaY(H)=6.6, lgaPb(Ac)=2.0, 化学计量点时溶液中pPb应为
【判断题】Sea dye marker 用来驱赶鲨鱼。