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4.4 Environmental Protection Requirements
4.4.1 Exhaust gas from lifting and transportation machinery shall comply with related national standard.Spent oil shall be collected for centralized treatment，and shall not be dumped or locally buried without permission.
4.4.2 Visible and clear signs shall be provided for power cables，communication cables and wire rope arrangement for lifting machinery.
4.4.3 No leakage is allowed for the oil piping of hydraulic lifting equipment.