简述拆离心式风机叶轮的步骤。

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