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 6WrtoK5v9R+R7idB6Gehe5OVnASLxa9byXqbkambVM9FEOl0G7t68Wlt3N/el2i0
