目的研究满耳甲腔与深耳道式耳塞对声音的衰减效果.方法听力正常的30名青年双耳分别配戴两种类型的定制耳塞,分别作纯音测听和声场......

Whale age at sexual maturity is one of the most important biological parameters that can be used in stock management and......