1 century = 100 1 year = 65438+ February.

The big month (3 1 day) includes:1\ 3 \ 5 \ 7 \ 8 \10 \ 65438+February.

Abortion (30 days) includes: April \ June \ September \165438+1October.

There are 28 days in February in a normal year and 29 days in February in a leap year.

There are 365 days in a normal year and 366 days in a leap year.

1 day = 24 hours 1 hour = 60 minutes.

1 minute = 60 seconds 1 hour = 3600 seconds.

2. Conversion of length units.

1 km = 1 000m1m = 10 decimeter.

1 decimeter =10cm1m =10cm.

1 cm =10mm.

3. Conversion of area units.

1 km2 = 100 hectare.

1 hectare = 1 10,000 square meters.

1 m2 = 100 square decimeter.

1 square decimeter = 100 square centimeter.

1 cm2 = 100 mm2.

4, the body (volume) product unit conversion.

1 m3 = 1000 cubic decimeter.

1 cubic decimeter = 1000 cubic centimeter.

1 cubic decimeter = 1 liter.

1 cm3 = 1 ml.

1 m3 = 1000 liter.

1 l = 1000 ml.

5. Conversion of weight units.

1 ton = 1000 kg.

1 kg =1000g.

1 kg = 1 kg = 2 kg.

1 kg = 10 Liang.