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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.跨C.3跨D.2跨



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5 ּܹ⼰_ҵʸ_ʸ...Aּ Bּ Cֹּܽ D...(1)ڲ,䳤ȲС 3 ...
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˼ǿ˵ijȲӦСżܸ߶ȵ( C ) A 50...C 100150 B 3 C 4 D 5 12ǽӦ...ּˮƽڲ,䳤ȲС(...
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Bࡢࡢۼšءݺˮƽˮƽӳʽ Cֹ Dľߴ 1.JGJ130-2011 й涨,ۼʽֹ...
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B C D 5ģ弰֧...򲻴 4 2ˮƽ()Ľͷ...Ŀȫڲз,ȫ...
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