??????
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1???????
2???????2 cm2?
3?5%1%?
4???????50??
5?????
6??????????????
7???1 cm2??
8???50cm2??
9???30%??
10???34?????
11?????????
12???100 cm2?
13??????????
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17??0.8?
18????????
19???1/3??
20?????
21?????????
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28??26 dB?56 dB?
29?????????
30?????
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28??26 dB?56 dB?
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