单项选择题
A.cetane number of 55
B.cetane number of 45
C.octane number of 55
D.octane number of 45
单项选择题 Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）
单项选择题 With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the（）
单项选择题 A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）