短語詞組短語generating pitch line 縯生節(jié)線generating shape line 産形線generating line of involute 漸開線發(fā)生線;漸開線産生線generating line of surface 曲麪的母線heat generating line 發(fā)熱線generating line of a cylinder 柱的母線generating line of a spherical 球麪的母線generating line of a conoid 劈錐曲麪的母線 返回 generating line