§9.1 Valence Bond Theory (VB) -9.1.1 The Essence and Characteristics of Covalent Bond -9.1.2 The Types of Covalent Bond 9.1.3 Hybrid Orbits 返 回9.1.1 The Essence and Characteristics of Covalent Bond §9.1 Valence Bond Theory (VB) 9.1.3 Hybrid Orbits 9.1.2 The Types of Covalent Bond