If the back clearance of a piston ring is excessive,（）<br>A:compression pressure in the cylinder will be higher<br>B:carbon will accumulate behind the ring<br>C:combustion gases will penetrate beneath the ring land<br>D:piston side thrust will be increased

If the back clearance of a piston ring is excessive,（）
A:compression pressure in the cylinder will be higher
B:carbon will accumulate behind the ring
C:combustion gases will penetrate beneath the ring land
D:piston side thrust will be increased

出自：海船船员证

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