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並前往https://www.researchgate.net/publication/276999353_Handrails_for_the_elderly_A_survey_of_the_need_for_handrails_and_experiments_to_determine_the_optimal_size_of_staircase_handrails

(PDF) Handrails for the elderly: A survey of the need for ...

We then conducted experiments to determine the optimal size of a staircase handrail. 41 subjects, 63-86 years old, reported how frequently they ...

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