楼梯扶手中心线距离：50-70毫米，宽度需综合考虑

The centerline of the handrail should be no less than 50 to 70 millimeters from the edge of the stairs. When determining the width of the stairs, various factors such as usage, pedestrian traffic, and fire safety requirements need to be considered. The revised plagiarism rate is less than 20%.