In order to increase the wearing resistance， the cylinder liner surfaces are sometimes （）.
举一反三
- The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.
- On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.
- The cylinder is fitted with internal liner so that a water space is left （） the liner and the outer wall.
- The cylinder head, cylinder liner and （） form the combustion chamber. A: Aframe B: Bpiston C: Ccrankcase D: Dexplosion plate
- A differential connection cylinder circuit,（ ）of the cylinder increase。 A: force B: pressure C: speed D: flow rate