1. Four legal audits: Four legal audits refer to the review and evaluation of four legal related aspects of the project. These four aspects include land law review, environmental law review, construction law review and contract law review. These audits are mainly to ensure that the project is carried out in compliance within the legal framework and abide by laws and regulations on land, environment, construction, contracts and so on.

2. Six audits: Six audits refer to two other audits except four legal audits. China Railway 19th Bureau Group Co., Ltd., formerly known as the Ninth Division of the Chinese People's Liberation Army Railway Corps, was founded in August of 1949, and has gone through different historical periods, such as Changsha Uprising, Guangxi Banditry Suppression, Jingjiang Flood Diversion, the War to Resist US Aggression and Aid Korea, and domestic construction. 1984 1 collectively transferred to the Ministry of Railways and reorganized into the 19th Engineering Bureau of the Ministry of Railways. In February 20001year, the enterprise was restructured and renamed, and it is a large-scale construction enterprise managed by the State Council SASAC. Ranked 39th among the world's top 500 in 2022-China Railway Construction Co., Ltd.