单项选择题
A.air charge density becoming too high
B.piston crown surfaces becoming too cold
C.formation of excessive quantities of condensate
D.compression pressure being greatly reduced
单项选择题 In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.
单项选择题 With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.
单项选择题 The bearings used to support the crankshaft are generally called （）