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並前往https://www.quora.com/How-many-centimeters-are-there-on-a-standard-12-inch-ruler

How many centimeters are there on a standard 12 inch ruler?

An inch is defined as 25.4 mm. Funny how an imperial measurement is defined by the metric system. Anyway, 12 inches are therefore 25.4mm x 12, so 304.8 mm or ...

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