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4. Safety of passengers 乘客安全 – 1乘客安全 – 2乘客安全 – 3乘客安全 – 45. Loading/unloading on gradients 在斜路起卸貨物6. Loading/unloading plant on gradients 在斜路上起卸工程機器的危險7. Advice on maintenance 有關維修的事項