单选题 Of all types of commercial internal combustion engines now built, which one usually gives the best performance, and hence is quite commonly used in marine applications, especially in larger sizes?

单选题 Engine speeds at which resonance(共振) can occur are termed ______.

单选题 Which of the listed conditions will affect the mean effective pressure mostly in the cylinders of a diesel engine?

单选题 The exhaust system for a turbocharged diesel engine functions to ______ .

单选题 Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?

单选题 When separating lube oil with a purifier, the optimal separating quantity is ______of the rated quantity on nameplate.

单选题 Oil mist detectors are usually used on board to detect oil mist density within ______ .

单选题 The diesel engine valve subjected to most severe conditions of service is the ______ .