【名词&注释】
热应力(thermal stress)、燃烧室(combustion chamber)、排气阀(exhaust valve)、二冲程(two-stroke)、四冲程柴油机(four-stroke diesel engine)、不可靠度(unreliability)
[单选题]As for a diesel engine, lack of combustion air may be due to ().
A. fouling turbine
B. fuel pump faults
C. lubrication failure
D. excessive cooling
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学习资料:
[单选题]如果某海区每年发生大风浪的概率Pw=0.25,某船每年经过该海区航行的概率Pv=0.1,该船航行不可靠度(unreliability)为F(t)=0.20,则该船在该海域遇险的概率P()为。
A. 0.0045
B. 0.9955
C. 0.8520
D. 0.005
[单选题]四冲程柴油机(four-stroke diesel engine)的进、排气阀和二冲程直流扫气柴油机的排气阀均是燃烧室的组成零件,直接受到高温高压燃气的作用,承受着()。
A. 机械负荷
B. 热负荷
C. 热应力
D. 热负荷和机械负荷
[单选题]In the four-stroke engine, it takes () to make one power stroke.
A. one propulsion
B. two propulsions
C. two revolutions
D. one revolutio
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