单项选择题
A.compression must be low for effective spark ignition
B.compression must be low for required horsepower and torque generation
C.compression must be low to prevent pre-ignition
D.compression must be low to have effective pre-ignition
单项选择题 The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）
单项选择题 Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）
单项选择题 If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be （）