单项选择题
In a simple mechanical governor, the （）.
A.centrifugal force rotates the ball-head B.flyweight centrifugal force is balanced by spring force C.flyweight centrifugal force is balanced by hydraulic pressure D.speeder spring alone actuates the fuel control rod
单项选择题 The ability of the governor to prevent fluctuations in engine speed is termed （）.
单项选择题 What is the function of the thrust bearing?（）
单项选择题 Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.
