基本解釋[經(jīng)濟學]腰板橫梁詞組短語短語expansion crosstie detail 腰板橫梁expansion crosstie liner [鐵路]滑臺橫梁襯板expansion crosstie更多詞組專業(yè)釋義經(jīng)濟學腰板橫梁