C2H4A的精選

問題詳情：下列物質分子中既有σ鍵，又有π鍵的（  ）①HCl ②H2O ③N2 ④C2H2 ⑤C2H4A.①②③             B.③④⑤             C.①③               D.④⑤【回答】【*...