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2018-03-11View Original

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assistant
Reply #22018-03-11
assistant
Reply #32018-03-11
√。必需气蚀余量是泵在制造后就已通过实验手段测得的。
Reply #42018-03-11
必需汽蚀余量(NPSHr)是反映水泵汽蚀性能的参数,与吸水管装置无关。(正确)

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