从而用微扰分子轨道理论半定量地解释了脂肪族的游离基取代和芳香族的游离基取代反应的反应性和选择性。
The reactivities and selectivities of aliphatic and aromatic free-radical(substitution)reactions were explained semi-quantitatively by the perturbation molecular orbital theory.
目的：探讨末端游离缺损义齿(牙合)支托设计的理论基础。
Objective: To test the rationale for designing an occlusal rest for a distal-extension removable partial denture.
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