单项选择题 An after-cooler installed between the turbocharger and the cylinder air inlet （）

单项选择题 Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.

单项选择题 If the low level alarm of the diesel fuel day tank fails to function, you can expect trouble from（）