728、Solenoid valves shall be shown with a notation indicating whether the valve is spring-loaded to the
open 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。

　 Solenoid valves shall be shown with a notation. The notation indicates the spring is loaded by the valve to
the open or closed position

　 Solenoid valves shall be shown with a symbol. The valve indicates whether the valve is spring-loaded to
the open or closed position.

　 Solenoid valves shall be shown with a mark. The mark indicates whether the valve is spring-loaded to the
open or closed position

答案解析

正确答案：C

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