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| 地表保护等级地表保护按保护物的用途、重要性、服务年限和变形所引起的后果划分保护等级, 不同保护等级的被保护物,在其周围留设不同的保护带宽度，使它不会因围岩移动而遭破坏或影响使用。地表保护物的保护等级分为I、II、III 三个等级 | |||
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