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3.1 ??5cm2????????
3.2 ??
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3.4 ????
3.5 ?????
3.6 ?2cm2??4cm?
3.7 ??
3.8 ????
3.9 ?
3.10 ?26dB?????
3.11 1cm??
3.12 ?????
3.13 ????
3.14 ??
3.15 ??
3.16 ??2???1??
3.17 ????
3.18 ??1cm?
3.19 ??5cm?4cm2?2cm2?
4 ??
4.1 ??15cm2?20cm2???...

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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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