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单选题
728、Solenoid valves shall be shown with a notation indicating whether the valve is spring-loaded to theopen or closed position. 电磁阀应该显示一个标记，表明阀门是弹簧加载到打开还是关闭位置。
A
Solenoid valves shall be shown with a notation. The notation indicates the spring is loaded by the valve tothe open or closed position
B
Solenoid valves shall be shown with a symbol. The valve indicates whether the valve is spring-loaded tothe open or closed position.
C
Solenoid valves shall be shown with a mark. The mark indicates whether the valve is spring-loaded to theopen or closed position
答案解析
正确答案：C
相关知识点：
电磁阀标记，表明弹簧开闭位
