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retractable scaffold bracket
retractable soot blower
retractable spear
retractable stairway
retractable steel joist
retractable steel rule
retractable tail wheel
retractable undercarriage
retractable water rudder
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retractable steel joist
➞
retractable steel joist
Definitions
[1] 伸缩式钢梁
[2] 可缩钢梁
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retractable steel joist