单项选择题
A.BeCl2 B.NH3 C.BF3 D.CO2
A.AlCl3 B.PCl3 C.MgCl2 D.CaCl2
A.H2O B.NaOH C.BaO D.CO2
A.MgO>CaO>NaF B.NaF>CaO>MgO C.CaO>MgO>NaF D.NaF>MgO>CaO
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