1km =1000m/1km =1000m, 1 m = 10 decimeter/1 m= 10 dm. 1 m = 1 decimeter =10cm/1DM =10 The unit of length refers to the basic unit for measuring spatial distance, and it is the basic unit of measurement formulated by human beings to standardize the length.

Square area system

1 ha =10000m2/1 hm2= 10000 m?

1 m2 = 100 m2/ 1 m2 = 100dm？

1 m2 = 10000 cm2/ 1 m2 = 10000cm？

1 square decimeter = 100 cm2/1 dm2= 100cm?

1 cm2 = 100 mm2/ 1 cm2 = 100mm？

Volume, volume conversion unit

1 m3 = 1000 m3/ 1 m3 = 1000dm？

1 decimeter cubic = 1000 cubic centimeter/1 dm3= 1000cm?

1 cubic decimeter = 1 liter/1 dm3 = 1 liter.

1 cm3 = 1 ml/1 cm3 = 1 ml

1 m3 = 1000 L/ 1 m3 = 1000 L

Weight unit conversion

1t = 1000kg/ 1t = 1000kg。

1 kg =1000mg/1 kg =1000mg

1 kg = 1 kg/1 kg = 1 kg

Time unit conversion

1 century = 100 year

1 year = 65438+ February.

Abortion (30 days) was 469 1 1 month.

February 28th in a normal year,

February 29th of leap year.

365 days a year,

A leap year has 366 days.

1 day =24 hours

1 =60 points