5.4.1 After an excavation cross-section is formed，cross-section survey shall be made.
5.4.2 The interval of the cross-section survey shall comply with the requirements in Table 5.4.2.
Table 5.4.2 Invertal of cross-section survey Ix/FKM4RYdO2gE20hGa63ZcR/XEgU4x/KAa2XuBXk/RP34IYMASTf5RgO8NNJu8i
