下列比较正确的是 A.熔沸点:单晶硅>碳化硅>金刚石       B

下列比较正确的是

A.熔沸点:单晶硅>碳化硅>金刚石       B.熔沸点:MgO>NaCl>KCl

C.熔沸点:Na>Mg>Al                 D.熔沸点:O2>I2>Hg

答案

B

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