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【单选题】
压水试验时，用安设在进水管上的压力计测压时，试段压压力P按下列（）公式计算。（式中：P为试压力；P 1 为压力计指标的压力；P 2 为压力计中心至压力计算零线的水柱压力；P 3 为管路压力损失）A.
P=P 1 +P 2 +P 3
B.
P=P 1 +P 2 -P 3
C.
P=P 1 -P 2 +P 3
D.
P=P 1 -P 2 -P 3
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