16. What is shown in the above figure?
O A. Oil control ring
B. Cam-ground piston
C. Compression ring 1
D. Compression ring 2
![16 What is shown in the above figure O A Oil control ring B Camground piston C Compression ring 1 D Compression ring 2 class=](https://us-static.z-dn.net/files/dad/eb1a682341adcd555096ae77f2a08f97.png)