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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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