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2???????2 cm2?
3?5%1%?
4???????50??
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7???1 cm2??
8???50cm2??
9???30%??
10???34?????
11?????????
12???100 cm2?
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16??0.5??0.8?
17??0.8?
18????????
19???1/3??
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28??26 dB?56 dB?
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