单选题Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）Aelectronic ignition systemBcompression of air by the pistonCfriction in the fuel injectorDfuel oil bearing system
单选题
Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）
A
electronic ignition system
B
compression of air by the piston
C
friction in the fuel injector
D
fuel oil bearing system
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