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单选题

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。

正确答案:A (备注:此答案有误)

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