| 摘要 |
PURPOSE: A bottom plate provided with a porous layer is provided to improve noise and vibration isolating effects and heat insulating effects. CONSTITUTION: The bottom plate provided with a porous layer comprises the steps of attaching a porous plate(20) whose grooves(21) are filled up with filler on a bottom plate(10), attaching woven fabrics(40) on the porous plate(20), re-attaching a porous plate(20) on the woven fabrics(40), then attaching an upper plate(50).
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