亚洲欧美中文高清在线专区-在线日本国产成人免费不卡-97精品国偷拍自产在线-免费精品国产人妻国语三上悠亚

Highway Engineering Service Introduction

To possess third grade qualification of general contract for highway engineering, and can undertake the construction for highways with single contract value below 5 times of enterprise registered capital, and for bridge projects with the length of single bridge below 200 meters or single span below 40 meters.