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並前往https://www.khanacademy.org/math/cc-fourth-grade-math/imp-measurement-and-data-2/imp-converting-units-of-length/a/metric-units-of-length-review

Metric units of length review (mm, cm, m, & km) - Khan Academy

Review the size of millimeters, centimeters, meters, and kilometers and how to convert between them. Then, try some practice problems.

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