单项选择题
A.fuel nozzle holders
B.exhaust value guides
C.engine cylinder liners
D.low temperature and a low viscosity
单项选择题 Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）
单项选择题 Gear-type flexible couplings are often used in diesel engine drive trains because they（）
单项选择题 Keel coolers fouled with marine growth, will result in （）