郭敦顒回答： k和m分别是国家法定计量单位中用于构成十进倍数（与分数）词头的中的千和兆， k=1000=10^3，千； m=10^6，兆（百万，1000²）。 m在长度单位中表示米，. Sign in to gmail tip: Learn how to sign in on a device that's not yours.
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