For any piston ring to operate smoothly without scuffing ,the ring must be （）.<br>A:of a material harder than the cylinder liner<br>B:properly lubricated<br>C:prevented from compressing<br>D:prevented from rotating during engine operation

For any piston ring to operate smoothly without scuffing ,the ring must be （）.
A:of a material harder than the cylinder liner
B:properly lubricated
C:prevented from compressing
D:prevented from rotating during engine operation

出自：海船船员证

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