单项选择题
A.dilutes the lube oil and reduces its viscosity
B.forms sulfuric acid in the lube oil
C.causes pitting and failure of the bearings
D.causes sludge deposits on valve stems
单项选择题 In the construction of a diesel engine, what is the purpose of end plates?（）
单项选择题 A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.
单项选择题 A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）