单项选择题
A.Air will enter the cooling system
B.Carbon will plug the water cooled exhaust manifolds
C.The jacket water temperature will rise
D.The lube oil viscosity will increase
单项选择题 Aburned exhaust valve may be detected by a higher than normal （）
单项选择题 In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and groove
单项选择题 If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）