effective gap有效缝隙宽度effectiveadj.有效的；生效的；实际的effective reinforcement depth有效加固深度effective depth of improvement有效加固深度effectiveness violation theory效用侵害说effective cut-off wavelength有效截止波长effective learning environment有效学习环境effectiveness evaluation model效能评估模型effective dynamic permeability有效动磁导率effective entanglement density有效缠结密度effective component of current[电] 电流有功分量effective technological supply技术有效供给