单项选择题
A.the peak pressure in a cylinder
B.the temperature of the cooling water
C.the fuel consumption
D.none of the above
单项选择题 The lower section of a piston is called the （）.
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.