短語詞組短語precritical crack propagated length 裂縫亞臨界擴展量crack s length 裂紋長度crack surface length 裂紋表面長度crack extend length 裂紋擴展長度crack critical length 裂紋臨界長度pre -critical crack propagation length 裂縫亞臨界擴展量equivalent crack length 等效裂紋長度allowed equivalent crack length 容許當量裂紋尺寸counting crack length [材]計算裂紋長度 返回 crack length