【单选题】
搭设脚手架立杆时，应遵守下列哪个规定？___
A. 每隔6跨设置一根抛撑，直至连墙件安装稳定后，方可拆除
B. 搭设立杆时，不必设置抛撑，可以一直搭到顶
C. 立杆搭接长度不应小于0.5m
D. 相邻立杆的对接扣件都可在同一个水平面内
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