??????????N
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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??
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 ?? ...
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??? 2011-01-06 18:09 ?????????????????]?????? 1.??,????,????.3-4??,?. 2.30g2??,????,?,2,?. 3.???,???,?3,????. 4.??100g,??,?1-2,?. 5.????,...
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??? 2011-01-06 18:09 ?????????????????]?????? 1.??,????,????.3-4??,?. 2.30g2??,????,?,2,?. 3.???,???,?3,????. 4.??100g,??,?1-2,?. 5.????,...
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??????????3,1/3?????,??????????,??,???,???,??????????????,?,??100%,????90%,??20%,?20%,??,57% ????,???????,,?????????,?????,??,,??,????,??,??? ?????3%??7%?4%?(??),?????,0.51?,?????,?????
?? 2011-08-09 08:49 ???
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?? 2011-08-...
?? 2011-08-09 08:49 ???
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?? 2011-08-...