正确答案: C

累计工作时间

题目：当滚动轴承的（）达到其额定使用寿命时，应换新轴承。

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学习资料的答案和解析：

[单选题]As a heat engine,（） energy is the source of power by which the diesel engine can be operated.

heat

[单选题]Opening of the cylinder （） will admit compressed air into the cylinder.

start valve

[单选题]Theoretical perfect combustion in a diesel engine yields by-products of （）.

water vapor and carbon dioxide