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单选题
The portion of the system is used to indicate the quantity, temperature and pressure of the hydraulic fluid, including items such as transmitters, indicators, warning systems, etc.
A
系统的这个部分用来显示数量、温度和液压油的压力，包括的项目有传输机、指示器和告警系统等。
B
用来显示液压油的质量，温度和压力的系统部分，包括转换器、指示器和告警系统等元件。
C
系统中用来指示液压油的油量、温度和压力的部分，包括传感器、指示器和告警系统等组件。
答案解析
正确答案：C
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