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单选题
电磁活门应在图表中显示，并包含一条注释，说明活门是由弹簧加载在开位还是关位。
A
See the graphics for information of the solenoid valves which shall contain a note indicating the position of the valve (whether spring-loaded to its open or closed position).
B
Solenoid valves indicated on the schematic shall have a notation indicating when the valve shall be spring-loaded to the open or closed position.
C
Solenoid valves shall be indicated on the schematic and shall include a notation indicating whether the valve is spring-loaded to the open or closed position.
答案解析
正确答案：C
相关知识点：
电磁活门图表注释考点
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