短语词组短语Covalent t Bonds 共价键Nonpolar covalent bonds 非极性共价键Multiple Covalent Bonds 多重共价键Saturation of covalent bonds 共价键的饱和Coordinate covalent bonds 共价配键;配位共价键Polar Covalent Bonds 极性共价键Carbon - Covalent Bonds 碳碳单键 返回 covalent bonds