伸缩比 magnification ration 伸缩管式联结 telescoping connection 伸缩缝 control joint ;dilatation joint ;expanded joist ;expansion joint ;movable joint ;variator ..
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... telescoping jack 双重螺旋起重器... telescoping connection 伸缩式连接,伸缩管式... telescoping drawbar 伸缩式连接装置,伸缩...
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