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单选题
电磁阀应该包括一个标志，表明阀门是弹簧加载到开启或关闭位置。
A
Solenoid switches shall indicate whether the valve is solenoid-loaded to the open or closed positon.
B
Electromagnetic valves shall include a marking indicating whether the valve is coil-loaded to the open or closed positon.
C
Solenoid valves shall include a notation indicating whether the valve is spring-loaded to the open or closed positon.
答案解析
正确答案：C
相关知识点：
电磁阀有标志，表明弹簧位置
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