单项选择题
In a full flow type lube oil system, the bypass relief valve will lift due to （）
A.a clogged filter element B.excessive lube oil pump discharge pressure C.excessive lube oil flow D.excessively hot lube oil
单项选择题 In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
单项选择题 A dirty lube oil strainer can result in（）
单项选择题 Differential needle valves used in fuel injectors are directly closed by（）
