单项选择题
The ability of the governor to prevent fluctuations in engine speed is termed （）.
A.sensitivity B.stability C.promptness D.speed droop
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 （）.
单项选择题 Proper filtering and straining of fuel oil is important because the （）.
