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单选题
The withdrawing of the cylinder liners, in general, depends on their （）.This may amount to approximately 1/120 of the diameter in some engines.
A
correct maneuvering
B
wear
C
working efficiency
D
maintenance
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单选题（）during the last repair?A
Did you have No.4 cylinder repairB
Do you have No.4 cylinder repairedC
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单选题The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.A
steelB
copperC
cast ironD
stainless steel
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