单位换算:3m=______mm=______um 300mm=________m=_______km 4.6×10的六次方nm=______mm=______m20km=_________________=_______m5.6×10的6次方m=____________________________=______nm300cm=___________________=________um

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单位换算:3m=______mm=______um 300mm=________m=_______km 4.6×10的六次方nm=______mm=______m20km=_________________=_______m5.6×10的6次方m=____________________________=______nm300cm=___________________=________um
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

单位换算:3m=______mm=______um 300mm=________m=_______km 4.6×10的六次方nm=______mm=______m20km=_________________=_______m5.6×10的6次方m=____________________________=______nm300cm=___________________=________um
3m=__3×10的3次方____mm=__3×10的六次方____um
300mm=____0.3____m=____3×10的-4次方___km
4.6×10的六次方nm=__4.6____mm=___4.6_×10的-3次方__m
20km=_________2×10的7次方mm________=__2×10的4次方_____m
5.6×10的6次方m=_____________5.6×10的3次方_km______________=__ 5.6×10的15次方____nm
300cm=________3m___________=____3×10的六次方___um