soffit of a floor
... 楼面覆面层：floor cover 楼面底部：soffit of a floor 楼面板：floor ...
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安装平衡机的地基不符要求，底部结合面未垫实，地脚螺栓未紧固，或放在楼面上，引起共振。
5 installation of balancing machine foundation does not meet the requirements, combined with the bottom surface without pad, the anchor bolt is not fastened, or on the floor, causing resonance.
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