单项选择题 To correct a hunting problem in a main propulsion diesel engine hydraulic governor, you should （）.

单项选择题 The （） engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.

单项选择题 As for turbine oil, contacting with water in the form of steam will be inevitable so good （） properties will be essential.