combination law组合律,并合律combinationn.结合；结合到一起的事物或人；密码combination of time and space时空结合combination draw-redraw die拉延再拉延组合模combination estimation weight组合赋权combination of sale promotion促销组合combination of two tax system两税合并combination switching network组合开关网络combination of shape and soul形神合一combination of flood and tide洪潮组合combination of drilling tools钻具组合combination trailer and crane拖车和起重联合机