抽样

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((chōu )(yàng )(chōu )(yàng ))

(cóng )()(liàng )(zhì )(pǐn )(huò )(cái )(liào )(zhōng )(chōu )()()(fèn )(zuò )(wéi )(yàng )(pǐn )()(chōu )(yàng )(jiǎn )(yàn )(chōu )(yàng )(diào )(chá )

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