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[单选题]

When fire pumps are used for other than firefighting service，each pipe connecting the other service (except for branch lines used for deck washing) must have a（）.

A . check valve installed in the line

B . shut off valve at a manifold near the pump

C . quick disconnect union within ten feet of the pump

D . regulator in the line set at 125 psi

参考答案与解析：

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