A.0.010~0.030g B.1.00~1.50g C.2.0~2.5g D.0.25~0.30g
A.鐵 B.鉑金 C.瓷 D.石墨
A.K2CrO4 B.K2Cr2O7 C.NH4Fe(SO4)2 D.熒光黃