已知一台泵轴承、轴封、圆盘摩擦损失与轴功率的比值分别为0.02、0.05、0.15,容积效率为0.85,水力效率为0.88,求该泵的总效率?
葡萄酒中铁的理化要求是()mg/L。 ["≤2.0","≤5.0","≤8.0","≤11.0"]
乙炔与氧气的爆炸范围是2.5-93%,其中含乙炔()时爆炸能力最强。 ["A.30%","B.10%","C.50%"]
中国第一瓶干红葡萄酒是()年在河北昌黎诞生的,研制人代表人物是() ["1963","1973","1983","1993","秦含章","严升杰","袁仁国","宁高宁"]
已知一台泵的实际流量为Q=310m3/h,漏渗量为Δq=49m3/h,求该泵的容积效率?