单项选择题
On opposite ends of a single shaft of a turboblower are a gas driven （）and a air compressor, which are sealed each other.
A.charge air receiver B.scavenging air belt C.turbine D.air cooler
单项选择题 On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the （）.
单项选择题 On a diesel engine, fuel is delivered into the combustion space by （）.
单项选择题 Oil will lubricate these parts （） effectively than water.
