單項選擇題

Aburned exhaust valve may be detected by a higher than normal （）

A.firing pressure
B.exhaust temperature from a particular cylinder
C.cooling water temperature
D.compression pressure

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單項選擇題

In a diesel engine, excessive cylinder liner wear will cause （）
Ⅰ.increased blow-by
Ⅱ.wear between the piston ring and groove

A.Ⅰonly is correct
B.Ⅱ only is correct
C.both Ⅰ and Ⅱ are correct
D.neither Ⅰ or Ⅱ are correct

單項選擇題

If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）

A.a low level in the engine expansion tank
B.excessively high coolant pressure
C.improper temperatures
D.malfunctioning of the jacket water heater