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【单选题】
下列每组中的各物质内均既有离子键又有共价键的一组是( )A.
NaOH、H 2 SO 4 、(NH 4 ) 2 SO 4
B.
MgO、 Na 2 SO 4 、NH 4 HCO 3
C.
Na 2 O 2 、KOH、Na 2 SO 4
D.
HCl、Al 2 O 3 、MgCl 2
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A.
选择1
B.
选择2
C.
选择3
D.
选择4
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