Without a doubt, whether the metric is net margin or balance sheet, the most profitable construction companies are full service type, providing“design, engineering, project management, construction and procurement” in the heavy industrial and civil sectors. You can contact Hangzhou Jiuyang Plastic Pipe Industry Co., Ltd.,Zhejiang Huajin Welding Machine Equipment Co., Ltd.,NINGBO INTELL PNEUMATIC TECHNOLOGY CO., LTD.,Zhuji Gede Import&Export Co., Ltd.,Cangzhou Xiyida Pipeline Co., Ltd. via the red button for more infomation.