单项选择题
A.excessive time required for warming-up
B.excessive freshwater corrosion
C.scale formation on the saltwater side
D.saltwater mixing with the freshwater
单项选择题 Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）
单项选择题 During extremely cold weather, while starting an engine, it turns too slowly and fails to startThis problem is most likely the result of （）
单项选择题 Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）