(1) Length measurement unit and forward speed: kilometers (kilometers), meters, decimeters, centimeters and millimeters.

1 km = l km1km =1000 m lm = lo decimeter1decimeter = =lo cm l cm = 10 mm 0 mm.

(2) Unit of measurement and rate of area: square kilometers, hectares, square meters, square decimeters and square centimeters.

1 km2 = 100 hectares lkm2 =1100 million m2.

L hectares = 10000 square meters 1 square meters = 100 square decimeter.

1 square decimeter = 100 square centimeter

(3) Volume measurement: cubic meter, cubic decimeter, cubic centimeter, liter and milliliter.

L cubic meter = 1000 cubic decimeter 1 cubic decimeter = 1000 cubic centimeter.

L cubic decimeter =l liter 1 cubic centimeter =l ml. 1L = 1000ml

(4) Quality unit and input rate: tons, kilograms, kilograms and grams.

1t = 1000kg 1k g = 1k g 1k g = 1000mg。

(5) Time unit and forward speed: century, year, month, day, hour, minute and second.

L century = 100 1 year = 1 February (3 1 day is1,3, 5, 7, 8, 10,1February.