Which of the following statements represents the function of

【名词&注释】

抗菌素(antibiotic)、表面粗糙度、机械性能(mechanical properties)、供应商(supplier)、制造厂(manufacturer)、检验报告单(inspection report)、轮机员(engineer)

[单选题]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 gap

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学习资料：

[单选题]轮机员^(engineer)应认真审核由供应商或制造厂提供的成品活塞的______检验报告单^{(inspection report)}，必要时有的项目进行复验。Ⅰ.材料成分；Ⅱ.形状和位置精度；Ⅲ.表面粗糙度；Ⅳ.机械性能；Ⅴ.无损探伤。

A. Ⅰ＋Ⅱ＋Ⅳ
B. Ⅰ＋Ⅳ＋Ⅴ
C. Ⅰ＋Ⅲ＋Ⅴ
D. Ⅰ＋Ⅳ

[单选题]气胸病人处理______。

A. 半卧位、不宜多搬动
B. 止咳、镇痛
C. 抗菌素控制感染
D. 以上都是

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