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单选题
指示子系统是指系统中用于指示压力的相关部分，其中包括压力报警系统。
A
Indicating subsystem is that portion of the system which is used to indicate pressure, which includes pressure warning system.
B
Indicating subsystem is that portion of the system which is used to increase or pressure, which includes pressure warning system.
C
Indicating subsystem is that portion of the system which is used to indicate pressure, which actually excludes pressure warning system.
答案解析
正确答案：A
