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viewimage.php?id=3db5c935ecd139aa7dbcdfb018d221&no=24b0d769e1d32ca73dec80fa11d028316f56ba15eaa5e1d2899cddb8d9a33ba99a1791851f4d46ad47953f91c3454a0a745054db661c12f4c7c03cd882e43519f996f117e2f8cf45cee16f01db07e6f0eb35b906cf690a8d7ac9514df845a3ac95d7b949e0

위에 문제 아래 솔루션인데 왜 L=20mm임?

- dc official App