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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
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is effective if used promptly on an oil fireB
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