中日韩视频在线观看,经典三级久久久久,国产午夜亚洲精品不卡,久久思思精品-亚洲精品国精品久久99热一,国产精品免费大片,激情,中文,日韩,,最近最好的中文字幕免费

 On 7^th November, 2013, approved by the department of housing and urban-rural development, the group company of steel structure project specialized contracting qualification by the secondary promoted to level.Since then, the group in the steel structure of contracting scope will expand to undertake various types of steel structure engineering, including network frame, light steel structure engineering, production and installation, continue to promote the group to further improve the market competitiveness.
    Steel structure project specialized contracting qualification is different from other professional contracting qualification, the qualification to the ministry of construction for approval.The steel structure engineering qualification promotion work after the data sorting, filing, project performance auditing on-site check, the ministry of construction, public announcements, etc