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1
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2
2.1??????????????????????? 2.2???????????
2.3 ????????????????????????
2.4 ??????????
2.5 ???????
2.6 ??????????????
3 ?
3.1 ??5cm2????????
3.2 ??
3.3 ?????
3.4 ????
3.5 ?????
3.6 ?2cm2??4cm?
3.7 ??
3.8 ????
3.9 ?
3.10 ?26dB?????
3.11 1cm??...

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??   2011-08-09 08:49 ???
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??   2011-08-...

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