A.O₂，I₂，Hg              B.CO，KCl，SiO₂

C.H₂O，H₂S，H₂Se     D.SiC，NaCl，SO₂

A.O₂、I₂、Hg                            B.CO、KCl、SiO₂

C.Na、K、Rb                             D.SiC、NaCl、SO₂

A.O₂，I₂，Hg                                 B.CO，KCl，SiO₂     

C.Na，K，Rb                                  D.SiC，NaCl，SO₂

A.O₂、I₂、Hg                                 B.CO、KCl、SiO₂

C.Na、K、Rb                                  D.SiC、NaCl、SO₂