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单选题

330.Solenoid valves shall be shown with a notation indicating whether
the valve is spring-loaded to the open or closed position.

A
 Magnet valves shall be marked with distinctions,is to indicate the
valve spring-loaded into the open or closed position.
B
 ElectroMagnetic valve shall be marked with a feature indicating whether
the valve is spring-loaded into the open or closed position.
C
 Solenoid valves shall be shown with a mark,is to indicate the valve
spring-loaded to the open or closed position.

答案解析

正确答案:C
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