国家标准规定，凡在坠落高度基准面２ｍ以上（含２ｍ）有可能坠落的高处进行的作业均称为高处作业，并划分了一类、二类、三类、特级等四类高处作业等级。据有关资料报道：死亡事故中有４０％以上属高处坠落。所以必须特别强调，在２ｍ以上悬空作业一定要系好安全带。这也... National standards stipulate that operations performed at heights that may fall more than 2m (including 2m) of the descent height reference plane are called high altitude operations and are divided into four categories: Classes I, II, III, and IV. Job level. According to relevant information, more than 40% of fatal accidents are falling at high altitudes. Therefore, special emphasis must be placed on the need to fasten the seat belts above 2 m. It also...