The same symbol, device, or code shall be used throughout the Handbook to depict the same system, valve or control.
A手册中应使用相同的符号，设备或代码来表示相同的系统.数值或控制装置。
B手册中应使用相同的符号，设备或代码来表示相同的系统.数值或调节装置。
C手册中应使用相同的符号，设备或代码来表示相同的系统.活门或控制装置。
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