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大横杆可用于设置在立杆内侧,其长度不能小于( )。 A.5跨B.4跨C.3跨D.2跨



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4ˮƽڲ,䳤ȲС3...50mm 2 2 B1500 C1000 D800 8˫...3תۼ̶ 10ˮƽ()Ľͷ...
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26ÿſȲӦС 4 ,ҲӦС ...˴ȲӦС 1m,Ӧȼ 3 ת...() 7ˮƽӦڲ,˳...
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Bࡢࡢۼšءݺˮƽˮƽӳʽ Cֹ Dľߴ 1.JGJ130-2011 й涨,ۼʽֹ...
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