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单选题
A branch line valve of a fire extinguishing system on a ship must be marked with the（）.
A
maximum pressure allowed at that branch
B
name of the space or spaces which it serves
C
date of the last maintenance inspection
D
pressure needed to maintain an effective stream at that point
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regulator in the line set at 125 psi
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the solenoid valve to seizeB
the compressor to huntC
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单选题A simple pumping system consists of a suction branch, a pump and （）.A
a priming deviceB
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a suction valve
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