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单选题
864、Solenoid valves shall be shown with a notation indicating whether the valve is spring-loaded to the open or closed position.
A
Solenoid valves shall be shown with a mark.The mark indicates whether the valve is spring-loaded to the open or closed position
B
Solenoid valves shall be shown with a notation.The notation, indicates the spring is loaded by the valve to the open or closed position
C
Solenoid valves shall be shown with a symbol.The valve indicates whether the valve is spring-loaded to the open or closed position.
答案解析
正确答案：A
解析：
解析:notation= symbol 符号,记号。loaded to 加载到,加载至。
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