赞题库-背景图
单项选择题

Point out the coordination number and the oxidation number of the central atom in coordination compound [Co(H2NCH2CH2NH2)2(NO2)Cl]Cl()

A.4,Ⅱ
B.6,Ⅱ
C.6,Ⅲ
D.4,Ⅲ