沉淀Fe(OH)3時,應(yīng)選用濾紙是:()?
A.快速濾紙 B.中速濾紙 C.慢速濾紙
欲配制6mol/LH2SO4溶液,在100mL純水應(yīng)加入濃H2SO4多少mL?()
A.50mL B.20mL C.10mL D.5mL
A.12 B.12.0 C.12.00 D.12.004