单项选择题
A.dust entering the high pressure stage
B.lube oil carbonization
C.discharge pulsations
D.inter-stage vapor lock
单项选择题 The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in （）
单项选择题 Which of the following statements is true concerning the cetane number rating of diesel fuel? （）
单项选择题 Which of the following statements is true concerning the cetane number of diesel fuel?（）