[单选] Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

A . Control the amount of lube oil burned in the combustion chamber
B . Transmit heat from the piston to the cylinder liner
C . Prevent damage to ring groove inserts by acting as a heat dam
D . Dissipate combustion chamber gas pressure by channeling it through the ring ga

Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（） grinding the spare plunger to the barrel。 replacing the plunger and the barrel。 highly polishing both the plunger and barrel。 replacing plunger only。文书转化为档案的基本条件：办理完毕、保存价值、（）、移交归档。什么是甲板室？何为熟料的碱比、钙比、铁铝比、铝硅比？什么是切片纺丝法？ Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

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[单选] Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

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