单选题In a diesel engine, a positive displacement type blower is usually （）Agear drive by the engineBdriven by an exhaust gas turbineCdriven by a camshaftDdriven by separate motor
单选题
In a diesel engine, a positive displacement type blower is usually （）
A
gear drive by the engine
B
driven by an exhaust gas turbine
C
driven by a camshaft
D
driven by separate motor
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