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並前往https://www.labour.gov.hk/eng/news/pdf/GN_on_S&H_of_Hand-dug_Tunnelling_Work_Eng.pdf

Guidance Notes on Safety and Health of Hand-dug Tunneling ...

Hand -dug tunnelling work is therefore a relatively high risk operation. According to the industrial accident statistics, construction of hand-dug tunnels has ...

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