Tapping directly to the surface absorption.

直接轻拍面上至吸收.

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This is due to short - wave surface absorption of energy is rather than get into the deep.

这是由于 短波 的能量被表面吸收而不能进入深层.

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This paper introduces a test method of surface absorption of medium density fiberboard ( MDF ) in Europe.

介绍欧洲中密度 纤维板 表面吸收的试验方法.

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