单项选择题
Which of the diesel engine cylinder liners listed has internal cooling water passages?（）
A.Internally finned liner B.Externally finned liner C.Wet liner D.Integral water-jacket liner
单项选择题 Diesel engine lube oil can become contaminated as a result（）
单项选择题 If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）
单项选择题 Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）
