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發(fā)布時間: 2012-11-11 22:56
正文摘要:汽蝕余量是指泵人口處液體所具有的總水頭與液體汽化時的壓力頭之差,用Dh表示。汽蝕余量又有有效汽蝕余量Dha和必需汽蝕余量Dhr之分。 Dha—指泵工作時實際所具有的汽蝕余量,取決于泵 ... |
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