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 i/NBmIn13BRO1fiA4j6y1BCqqzJnnC9IaF1dn+ELKHkjbfQ6JhVRn9VQGeRNsxR3
