单选题Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）Acylinder valvesBcompression ringsCpiston skirtsDoil rings
单选题
Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）
A
cylinder valves
B
compression rings
C
piston skirts
D
oil rings
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