coyu 发表于 2006-3-14 10:04 可以把figure63也贴出来吗?我是这样认为的:人耳对3kHz—5kHz声音最敏感,幅度很小的声音信号都能被人耳听 ...
Undo
Redo
Table
Removeformat
Autotypeset Left Center Right
FloatLeft FloatRight Orderedlist Unorderedlist
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