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【多选题】
关于扣件式钢管脚手架纵向水平杆、横向水平杆构造，说法正确的有（ ）。A.
纵向水平杆杆长度不应小于3跨；
B.
纵向水平杆接长应采用对接扣件连接;
C.
主节点处必须用直角扣件扣接一根横向水平杆，且外露不小于100mm；
D.
纵向水平杆应设置在立杆外侧；
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