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當(dang)承受地(di)震(zhen)作用(yong)時,應采用(yong)雙螺(luo)母固定(ding),或采用(yong)其它(ta)有效(xiao)防止松動的(de)措施(shi),但地(di)腳螺(luo)栓...
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u型(xing)螺栓規格型(xing)號表(biao),gb4321標(biao)準u型(xing)螺栓,8.8級u型(xing)螺栓生(sheng)產公司,懸挑...