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【单选题】
钢管脚手架的内外两个侧面除设交叉支撑杆外，当架高超过（）m时，还应在脚手架外侧沿长度和高度连续设置剪刀撑，剪刀撑钢管规格应与门架钢管规格一致。当剪刀撑钢管直径与门架钢管直径不一致时，应采用异型扣件连接。A.
10
B.
20
C.
30
D.
40
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