A swing check valve is used in a pipeline to （）.<br>A:maintain a preset pressure on the line<br>B:closely regulate the amount of flow<br>C:relieve excessive pressure on the line<br>D:allow flow in one direction only

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

出自：海船船员证

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