高山出好茶是因为高山上的茶园温度相对比较低,它吸收到散射光慢射光,茶多酚含量会相对增加,氨基酸含量会相对减少,茶的味道会比较好。
A. 对
B. 错
A pump’sdisplacementis0.006L/r.Whenitrunsat1200rpm,theoutputflowrateofpumpwillbe
A. 2L/min
B. 5L/min
C. 7.2L/min
D. noneoftheabove
Volumetricefficiencyistheratioof
A. theoreticalflowratetoactualflowrate
B. inputpowertooutputpower
C. outputpowertoinputpower
D. actualflowratetotheoreticalflowrate
Apump’sworkpressurep=10MPa,actualflowrateisQ=60L/min,thevolumetricefficiencyηv=0.9,andthemechanicalefficiencyηm=0.94.Calculate:1)Outputpowerofthepump;2)Inputpowerofthepump.(计算过程写在纸上,拍照后以图片上传)