... unstationary vibration 不固定振动 unstayed 未加支撑的 unstayed flat heads and covers 无支撑平封头和盖板 ...
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unstayed post 无支索起重柱
unstayed mast 无支索桅
unstayed flat heads and covers 无支撑平封头和盖板
unstayed covers 没有拉撑的平盖板
flat unstayed circular head 无支撑圆形平封头
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