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口袋里有三种颜色的筷子各10根,请问,至少要取多少根筷子才能保证一定取到2种不同颜色的筷子各2双?()

口袋里有三种颜色的筷子各10根,请问,至少要取多少根筷子才能保证一定取到2种不同颜色的筷子各2双?()A.4 B.10 C.11 D.17

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某蓄水池有一进水E1A和一出水11B,池中无水时,打开AV1关闭8口,加满整个蓄水池需2小时:池中满水时,打开B口关闭A

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