单选题A swing check valve is used in a pipeline to （）.Amaintain a preset pressure on the lineBclosely regulate the amount of flowCrelieve excessive pressure on the lineDallow flow in one direction only
单选题
A swing check valve is used in a pipeline to （）.
A
maintain a preset pressure on the line
B
closely regulate the amount of flow
C
relieve excessive pressure on the line
D
allow flow in one direction only
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