0 class

1 000 MW class air-cooled unit

10000-ton class train

1000MW class ultra supercritical unit

1st class certisify seed potato

1st Class or 2nd Class Control

20 kV voltage class

20kV voltage class

3he Jinping Second Class Hydropower Station

Ⅲ class equation

4-class

5 class marking system

500kv voltage class

600 MW class

600MW class units

610 MPa class

660V voltage class

70 t Class

99 year’s graduate class in Nanjing Meteorological College

9F class gas turbine