Deg problem difrod fawr berynnau

Deg problem difrod fawr berynnau ：

1. Stripping

2. llosgi

3. Diffyg crac

4. Cawell wedi torri

5. Anaf cerdyn crafu

6. Cyrydiad rhydlyd

7. Sgraffiniol

8. sgrafelliad

9. Electro-ysgythriad

10. Cleis indentation