短语词组短語welding multi billet rolling 銲接小方坯軋制shaped billet rolling machine 異性坯輥道billet rolling train 小胚輥軋系列whole billet rolling 整坯軋制rolling billet 軋制用鋼坯;軋制用坯hot -rolling billet 熱軋坯料 返回 billet rolling