Area unit: 1 km2 =100ha,1hectare = 10000 m2, 1 m2 = 100 m2. Commonly used rate: 1 m2 = 10000 cm2.
Volume (volume) unit: 1 m3 = 1 000m3, 1 m3 =1000m3,1cm3 =1000m3; 1 cubic decimeter = 1 liter, 1 cubic centimeter = 1 ml, 1 liter = 1000 ml.
Time unit: 1 century = 100, 1 year = 65438+February, 1 month =28~3 1 day, 1 day =24 hours, 1 day = 24 hours. Common propulsion speed: 1 year =365 (normal year) ~366 (leap year) days, 1 hour =3600 seconds.
Unit of weight: 1t = 1000kg, 1kg = 1000g. Common weight units and feed rates: 1 kg =500 g, 2 kg = 1 kg.
Unit rewriting method: the unit is changed to decimal to increase the multiplication rate, such as 1 ton = 1000 kg (1*1000); The unit becomes larger and smaller, divided by the forward speed, such as1000kg =1t (1000/1000).