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當(dang)承受地(di)震作用(yong)(yong)時,應采用(yong)(yong)雙螺母(mu)固定(ding),或(huo)采用(yong)(yong)其(qi)它有(you)效(xiao)防止松動的措施,但(dan)地(di)腳螺栓...
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