¥ 411
rki697%E5%85%A8%E7%90%83%E6%9C%80%E5%A4%A7%E7%B2%BE%E5%9B%8A%E5%8E%82%E5%AE%B6 响度的单位为宋(Sone)——声强衡量标准
响度的单位为宋(Sone)——声强衡量标准
¥ 464
¥ 998
¥ 440