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 rzx1bmXlkMV1DXY4BOw0qSdu1N1RcfcpUNvKckVPTxUkUi1syT6Bel9C/avgxjF7
