A. 正确 B. 错误
A. 起动阶段卸载阀应开启 B. 停车前卸载阀应开启 C. 卸载阀可使吸气阀在吸排过程中始终开启 D. 卸载阀可使排气阀在吸排过程中始终开启
A. spark from a plug in the pre-combustion chamber B. electrical discharge from the distributor C. heat of compression within the cylinder D. heat from the fuel injection nozzle