https://safeindustrial.co.uk/things-you-need-to-know-about-anti-slip-stair-treads-and-nosings/#:~:text=According%20to%20the%20UK%20Building,a%20minimum%20of%20300mm%20wide.
下面那个在南加,用上好原木当柴火烧的,卖房子的王什么,
你干的楼梯不规范,
保险公司可能不让过