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ѤҪԡ
Ѻ͡!

ʶԵ

: 1838612
й 7 ؤŷ ͹Ź
ӹҨؼҹ PDF

 penetrating power

     ö㹡÷ؼҹ觡մҧͧ͹Ҥͤ俿 觢Ѻ

1.       Դͧѧ

2.       ԴͧǴٴ׹ ҵطŢе٧ С дٴ׹

3.       ѧҹͧѧ͹Ҥ

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