评判题 pérdida汽蚀余量是泵在制造后就已通过实验手段测得的。
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z. � 必须汽蚀余量（NPSHr）是反映水泵汽蚀性能的参数，与吸水管装置无关。
z. 须 要
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评判题 损失汽蚀余量是泵在制造后就已通过实验手段测得的。
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