????
? ????, ??????????,????
????????????
???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??
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????
4.2 ?????1cm????1.5cm???
4.3 ????????
4.4 ???
4.5 ??
4.6 ??
4.7 ????
4.8 ???
4.9 ??
4.10 ?
5 ?
5.1 ??15cm2?20cm2?
5.2 ?????1cm???
5.3 ??????
5.4 ???
5.5 ???????
6
6.1
6.1.1 ???20cm2??4cm2??
6.1.2 ...
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???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??
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????
4.2 ?????1cm????1.5cm???
4.3 ????????
4.4 ???
4.5 ??
4.6 ??
4.7 ????
4.8 ???
4.9 ??
4.10 ?
5 ?
5.1 ??15cm2?20cm2?
5.2 ?????1cm???
5.3 ??????
5.4 ???
5.5 ???????
6
6.1
6.1.1 ???20cm2??4cm2??
6.1.2 ...
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