单选题If the back clearance of a piston ring is excessive,（）Acompression pressure in the cylinder will be higherBcarbon will accumulate behind the ringCcombustion gases will penetrate beneath the ring landDpiston side thrust will be increased
单选题
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
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