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【简答题】
一定转速下,用离心泵向表压为50kPa的密闭高位槽输送密度1200kg/m3的水溶液,泵出口阀,管路特性方程He=K+Bqe2。改送20度的清水则B( ),K( )。(不变、增大、减小、无法确定)
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