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No Plagiarism!1ioFredvj7onfXrdP9kSposted on PENANA
井邊有容量5公升跟3公升的兩個水桶,699Please respect copyright.PENANAL23pOQrRFw
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該如何利用這兩個水桶,裝出剛好4公升的水呢?699Please respect copyright.PENANA5FUyuHTQ0T
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699Please respect copyright.PENANAbh1CH2SQCk
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