Which of the valves listed should be used either in the fully opened or the fully closed position?（）<br>A:A gate valve<br>B:A globe valve<br>C:Any check valve<br>D:Any needle valve

Which of the valves listed should be used either in the fully opened or the fully closed position?（）
A:A gate valve
B:A globe valve
C:Any check valve
D:Any needle valve

出自：海船船员证

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