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【简答题】
如图所示,在一输送水的水平管段两截面( 1-1‘ 、 2-2’ )倒置 U 形 管压差计,其指示剂为空气,压差计读数 R =200mm 。试求两截面间的压强差( P1-P2 )。
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举一反三
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