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ru he xuan yong fang zao hu er qi
Pages: 32
Year: Issue:  1
Journal: Occupational Health and Emergency Rescue

Abstract: <正> 护耳器是一种防止噪声危害的个人防护用品,根据其结构特点和使用范围,可分为耳塞、耳罩和帽盔。常用塑料和橡胶制成的耳塞,一般有大、中、小三种或多种规格,应按耳道大小选择;泡沫塑料和防声棉耳塞是
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