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（）.Acheck valve installed in the lineBshut off valve at a manifold near the pumpCquick disconnect union within ten feet of the pumpDregulator in the line set at 125 psi
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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