Schematic diagrams may be used to indicate flow and to illustrate the operation of systems such as air control, electrical, fluid power, fuel and turbo systems.
AA. 原理图可以用来表示流程，并说明系统的工作过程，如空气控制
BB. 原理图可以用来表示流程，说明系统的工作原理，如空气分配
CC. 原理图可以用来表示流程，并说明系统的操作，如空气控制
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