短語詞組短語structural weakness plane of rock 巖體軟弱結構面low -angle structural-plane 緩傾角結構面step structural plane 臺階結構面flat structural plane 平直結構面divisional structural plane 分劃性結構面tensional structural plane 張性結構面structural plane roughness 結構面粗糙度types of structural plane 結構面類型Structural plane distribution 結構面分布 返回 structural plane