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单选题
可以使用原理图指示系统“流向”、阐明系统工作原理，例如空气控制、电源、液压、燃油和涡轮系统。
A
Schematic diagrams may be used to indicate "flow" and to illustrate the operation of systems such as air control, electrical, fluid power, fuel and turbosystems.
B
Principle charts can be intended to show "flow" and explain the operation of systems as well as air control, electrical, hydraulic power, fuel and turbine systems.
C
Schematic diagrams can be employed to show "flow" and to explain the operation of systems along with air control, electrical, fluid power, fuel and turbosystems.
答案解析
正确答案：A
相关知识点：
原理图可指示系统工作原理
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