A.3%~5% B.5%~10% C.10%~15% D.10%~20%
A.煤油 B.水 C.HNO3溶液 D.NaOH溶液
A.2%硼酸溶液 B.5%小蘇打溶液 C.2%HNO3溶液 D.1%KMnO4溶液