A gate valve installed in a pipeline should be （）.<br>A:used in either the fully dosed or fully opened position<br>B:installed with the stem down<br>C:used for steam service only<br>D:used to throttle or regulate the flow of liquid

A gate valve installed in a pipeline should be （）.
A:used in either the fully dosed or fully opened position
B:installed with the stem down
C:used for steam service only
D:used to throttle or regulate the flow of liquid

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