短语词组短語box corner column 箱形角柱box steel column 箱形鋼柱box type column [建]方立柱concrete box pier column 混凝土箱形墩柱box -column to I-beam connection 箱型柱box x column 箱形柱welded box cross column 箱型組郃截麪box shape steel column 箱形鋼柱 返回 box column