问题描述:
单位换算:3m=______mm=______um 300mm=________m=_______km 4.6×10的六次方nm=______mm=______m
20km=_________________=_______m
5.6×10的6次方m=____________________________=______nm
300cm=___________________=________um
20km=_________________=_______m
5.6×10的6次方m=____________________________=______nm
300cm=___________________=________um
问题解答:
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