【单选题】【消耗次数：1】
吊屋架时采用横吊梁的主要目的是：( )
①
减小起重高度
②
防止屋架上弦压坏
③
减小吊索拉力
④
保证吊装安全
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【判断题】
起重机司索工在吊装作业前，应估算吊物的质量和重心，以免吊装过程中吊具失效导致事故。根据安全操作要求，如果目测估算，所选吊具的承载能力应为估算吊物质量的1.2倍以上。
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