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•Ӌ

2014-11-20 10:21(li)ԴO̽W(wng) ӡ | ղ |
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| | С

1ͷؐ

1

˂ (tng)X(ju)`c•֮gP(gun)ϵǾ(xin)P(gun)ϵӽP(gun)ϵ÷ؐλM(jn)ȿɌܴ•􏊶M(jn)ЌsҲ˶•푑`̶ʹ“”ĸ•ď

•W(xu)cͬ(li)ʣ֮ȡ“”ĸĆλr(sh)ĆλؐBell䌦ȡ10׵Č̖B

2ؐ

•W(xu)Ќ•ʵăɂ(g)ͬ(li)•W(xu)ɂ(g)•ƽ֮ȡ10׵Čٳ10ԓĆλQ(chng)ؐӛdB

2•

••(li)•ď•••P(gun)ϵ•׃20dBஔ•ֵ׃10•׃40dBஔ•ֵ׃100

3•ʼ

•Դ•ʼ@(g)•Դ•c•ʵȡÌٳ10

4(dng)ٶȼ

(dng)ٶƽcʼٶƽıֵȡ10׵Č10͵õ(dng)ٶȼ(jin)C(dng)ٶЧֵٶȷֵ3~5һ˄X(ju)Ĵֱ(dng)ٶȼ60dB

5(dng)

(dng)ָļٶȼ

؟ξ݋soso
]

4+ǰģM} W(xu)Ч

(jng)νM (zhun)ھ(xin)

ɫͨP(gun)ࣺڿԇYһP(gun)]
ɫo(w)n(yu)ࣺԇڲ^(gu)ڶMW(xu)

4+ǰģM}+1Ayԇ}

ܽn AΜyԇc(din)u

ƷͨP(gun)ࣺڿԇYһP(gun)]
Ʒo(w)n(yu)ࣺԇڲ^(gu)ڶMW(xu)

ǰģM}+2Ayԇ}+ǰ_P(gun)

ֱ һһۙ̌W(xu)

(sh)ͨP(gun)ࣺڿԇYһP(gun)]
(sh)o(w)n(yu)ࣺԇڲ^(gu)ڶMW(xu)

ǰģM}+3Ay}+_P(gun)+ǰc(din)

󔵓С̌W(xu) ˽˶Ʒ(w)

ͨP(gun)ࣺڿԇYһP(gun)]
Ɵo(w)n(yu)ࣺԇڲ^(gu)ڶMW(xu)

֪Rc(din)Ԫ ʮһn

ܽn AΜyԇc(din)u

ͬĿo 7ۃ(yu)

•

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