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下列物质的电子式书写正确的是
A.NaCl B.H2S
C.NF3 D.NH4I
A.NaCl
B.H2S
C.-CH3
D.NH4I
C.-CH3 D.NH4I
A.NaCl: B.H2S:
C.硫离子结构示意图: D.NH4I: