Once a symbol or device is established for a valve or control, it shall be used for this type of unit throughout the manual.
AA. 一旦确定了活门或控制装置的符号或设备，则应在整个手册中将其用于相关组件。
BB. 只要确定了活门或控制装置的特征或设备，则应在整个手册中将其用于此类装置。
CC. 一旦确定了活门或控制装置的符号或设备，则应在整个手册中将其用于此类装置。
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