1, unit of length measurement and advancing speed: kilometers (km), meters, decimeters, centimeters, millimeters1km = LKM1km =1000 m l meters = LDM1mm = LCM l cm:. Square centimeter 1 square kilometer = 100 hectare l square kilometer = 100000 square meter l hectare = 10000 square meter 1 square meter = 10. 0 square decimeter 1 square decimeter = 100 square centimeter 3. Volume and 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.4. Mass unit and forward speed: ton, kg, kg, g 1 ton = 1000 kg 1 kg = 1 kg = 1000 g5. Time unit and forward speed: century, year, month and day. Hours, minutes, seconds l Century = 100 1 year = 12 months (months of 3 1 day include 1, 3, 5, 7, 8, 10,/kloc. February 29th) 1 day =24 hours 1 hour =60 minutes 1 minute =60 seconds 1000 micron = 1 mm = 10. m = 1km 1000g = 1kg = 1kg 2kg = 1kg 100 ms = 1s 60s = 1min = 15min。 0 days = 65438+1 October 65438+February = 1 year 1 km = 1000m 1 m = 1 0 decimeter1decimeter. 438+0km2 = 1 00ha1hectare =1000m2/mu = 666.666m21m2 =100m2 = Unit conversion 1 m3 = 1000 cubic decimeter 1 cubic decimeter = 1000 cubic centimeter 1 cubic decimeter = 1 liter 1 cubic centimeter =/kloc-0. 438+0000kg 1 kg = 1000g 1 kg RMB unit conversion 1 yuan = 10 angle/kloc-0 angle =10 minute/kloc-0. 2000 1 year =1February (3 1 day) includes:1\ 3 \ 5 \ 7 \ 8 \10 \1February (30 Leap year 366 days 1 day =24 hours 1 hour =60 minutes 1 minute =60 seconds 1 hour =3600 seconds. Give me the best.