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http://www.pc-view.net/Business/041118/page41.html $B$+$iC)$l$k(B
http://saunderslog.com/2006/06/12/the-mosquito-ring-tone-this-adult-can-hear-it/ $B$G!"(B

Mosquito
15102 Hz pure sine wave
16000 Hz pure sine wave
16961 Hz pure sine wave
17959 Hz pure sine wave

$B$,A4$FJ9$3$($?$N$G$A$g$C$H0B?4!#(B

$B$A$J$_$K(B Mosquito $B$,2?(B Hz $B$J$N$+$h$/J,$+$i$J$$!#(B

-- 
KANAI
