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单选题
指示是系统中用来显示空气系统的温度、压力、控制位置等的部分。包括发射机、指示器等项目。
A
Indicating is that portion of the system which is used to indicate temperature, pressure, control positions, etc. of the air systems. Includes items such as transmitters, indicators, etc.
B
Indicators are systems used to display air temperature, pressure, control position, etc. It includes switches, thermometers and other components.
C
Indication system is used to indicate atmospheric temperature, pressure, control position, etc. It includes crossfeeding system, thermometer and other components.
答案解析
正确答案：A
相关知识点：
指示系统作用及包含项目记
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