①高沸点　②能溶于水　③水溶液能导电　④低熔点　⑤溶融状态不导电

A.①②③                    

B.③④⑤              

C.①④⑤                    

D.②③⑤

A.H₂S、SO₂         

B.O₂                           

C.H₂S                  

D.SO₃

A.CH₄·14H₂O                                        

B.CH₄·8H₂O

C.                  

D.CH₄·6H₂O

A.两种都是极性分子   

B.两种都是非极性分子

C.CH₄是极性分子，H₂O是非极性分子    

D.H₂O是极性分子，CH₄是非极性分子

A.阴极                        

B.正极                 

C.阳极                 

D.负极

A.石英                        

B.硫磺                 

C.干冰                 

D.食盐

A.氨                                        

B.四氯化碳

C.氮                                       

D.二氧化碳

A.二氧化硫                 

B.氮氧化物          

C.二氧化碳          

D.悬浮颗粒

A.57                           

B.47                     

C.61                           

D.293

A.Ca(OH)₂                   

B.Ca(ClO)₂                       

C.CaCl₂                

D.CaCO₃