A、of a material harder than the cylinder liner
B、properly lubricated
C、prevented from compressing
D、prevented from rotating during engine operation
更多“For any piston ring to operate smoothly without scuffing ,the ring must be （）.”相关的问题
A、transfer heat from the cylinder to the piston B、scrape oil from the sides of the piston C、seal the combustion space from the crankcases D、prevent any piston contact with the cylinder liner
A、wide compression rings are used B、oil rings are located above the piston C、chromium plating is used on all piston rings D、oil rings are located near the bottom of the piston skirt
A、A.is coming upward；cylinder ring belt B、B.is going downward；piston ring belt C、C.is coming upward；piston ring belt D、D.is going downward；cylinder ring belt
A、top of the piston and bottom side of head, with the piston at BDC B、piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDC C、bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placement D、top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
A、A.Used of bimetallic piston rings B、B.Ring gap pre-tensioning C、C.Thermal increase in ring-end clearance D、D.Gas pressure acting against the back of the ring
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