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並前往https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.23

1910.23 - Ladders. | Occupational Safety and Health ... - OSHA

Steps on stepstools are spaced not less than 8 inches (20 cm) apart and not ... at least 3 feet (0.9 m) above the upper landing surface (see Figure D-1 of ...

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