短语词组短语polar covalent bond [物化]极性共价键;则分子为极性分子;极性共价健polar r bond 极性键non -polar bond [物化]非极性键;非极性共价键;翻译;非极性键non polar bond 非极性键Polar of Covalent Bond 键的极性semi polar bond 半极性键non n polar bond 非极性键Semi -polar Bond 半极键 返回 polar bond