7.8dm= m= mm 70微米= m= mm 500立方釐米=立方米0.5昇=立方分米=立方米0,5噸=千克10-10米納米微

7.8dm= m= mm 70微米= m= mm 500立方釐米=立方米0.5昇=立方分米=立方米0,5噸=千克10-10米納米微

7.8dm=0.78m=780mm,70微米=7x10的-42次方,500立方釐米=0.0005立方米,0.5昇=500立方分米=0.5立方米,0.5噸=500千克