happyman 发表于 2008-1-8 13:09

sound frequency range

a very clear figure

happyman 发表于 2008-1-8 13:11

another figure, noise level

hyl2323 发表于 2008-1-8 14:05

很好，简洁易懂，过目不忘。
页: [1]
查看完整版本: sound frequency range