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밸브_부분8
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4
4 1.
,
,
.
4
, ,
, ,
,
.
.
2018000Hz,
3000Hz .
.
(Decibel)
(1000Hz)
10,100,1000 10, 20,
30dBA .
ISA (Instrument Society of America)
45 0.9m
, KOSO 1m .