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Listentothepassagetwiceandfillintheblankswithwhatyouhear.Whendescribingyourproductforabusinessplan,youshouldstartbyaskingyourself,“WhatproductamIselling?”Inansweringthequestion,youcanexplainwhattheproductisandwhattheproduct.Thenyoucanlistthespecialpointsthatmakeyourproductdifferentfromothers.,youshouldstatehowyourproductwillbenefitcustomers.Thedescriptionofyourproductshouldclearlystate.Describethespecialpointsofyourproductandhoworwhyitwillattractcustomers.Emphasizeanyspecialpointsthatyoufeelwillattractcustomersandexplainhowandwhythesepointsareattractive.Trytodescribethebenefitsofyourproductfromyourcustomers’.Successfulbusinessownersknoworatleasthaveanideaofwhattheircustomerswantorexpectfromtheirproduct.Thistypeofknowledgecanbehelpfulinbuildingandloyalty.

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两台同型号水泵对称并联运行时,其总流量为QⅠ+Ⅱ，当一台水泵停车只剩一台运行时的流量为Ｑ,若管路性能曲线近似不变,则有

A. QⅠ+Ⅱ>2Q
B. QⅠ+Ⅱ＝2Q
C. QⅠ+Ⅱ<2Q
D. QⅠ+Ⅱ＝Q

当水泵并联运行时，

A. 流量相等，能量叠加
B. 流量相等，能量相等
C. 流量叠加，能量相等
D. 流量叠加，能量叠加

并联水泵流量相叠加，扬程不变

A. 对
B. 错

下列哪些属于水泵的运行调节

A. 阀门调节
B. 调速调节
C. 变径调节
D. 变频调节