千米kilometre,米metre/meter,分米decimetre ,厘米centimetre,毫米millimeter,微米micron (简写μm),纳米nanometre,千克kilogram,克gram,小时,hour,分minute,秒second,吨ton
千米kilometre,米metre/meter,分米decimetre ,厘米centimetre,毫米millimeter,微米micron (简写μm),纳米nanometre,千克kilogram,克gram,小时,hour,分minute,秒second,吨ton