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並前往https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.1053

1926.1053 - Ladders. | Occupational Safety and Health ...

The rung spacing on the extension section of the extension trestle ladder shall be not less than 6 inches (15 cm) nor more than 12 inches (31 cm), as measured ...

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