短語詞組短語R -factor control 減徑因子r -facto 因子vascula r endotheIialgrowth factor 血管內(nèi)皮生長因子circular r thickness factor 弧齒厚系數(shù)layer r structure factor 成層構(gòu)造因子laser r amplification factor 激光婆大系數(shù) 返回 R factor