【名词&注释】
使用寿命(service life)、滚动轴承、工作时间(working time)
[单选题]当滚动轴承的()达到其额定使用寿命时,应换新轴承。
A. 使用寿命
B. 运转时数
C. 累计工作时间
D. 正常磨损期
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学习资料:
[单选题]As a heat engine,() energy is the source of power by which the diesel engine can be operated.
A. electric
B. heat
C. mechanical
D. exhaust
[单选题]Opening of the cylinder () will admit compressed air into the cylinder.
A. safety valve
B. indicator cock
C. blow-down valve
D. start valve
[单选题]Theoretical perfect combustion in a diesel engine yields by-products of ().
A. aldehydes and carbon dioxide
B. water vapor and carbon monoxide
C. nitrogen and carbon monoxide
D. water vapor and carbon dioxide
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