单选题
区别离心泵和轴流泵的主要依据是（）。
发布日期：2021-03-22
叶轮中液体的流态和比转数
是否有导水锥
叶轮的旋转方向和叶片的扭曲程度
出水管的形状和大小
试题解析
离心泵
离心泵（centrifugal pump）是指靠叶轮旋转时产生的离心力来输送液体的泵。
- 中文名
- 离心泵
- 汉语拼音
- li xin beng
- 材质
- 铸铁铸钢.不锈钢塑料玻璃钢.合金
- 外文名
- Centrifugal pump
- 所属行业
- 机械制造业
- 密封
- 填料密封，付叶轮，机械密封等
轴流泵
轴流泵靠旋转叶轮的叶片对液体产生的作用力使液体沿轴线方向输送的泵，有立式、卧式、斜式及贯流式数种。中国从1961年起先后研制了大型轴流泵共664台套。其比转数n分别为500、700、850、1000、1250、1400、1600等；转轮直径为1.6m、2.0m、2.8m、3.0m、3.1m、4.0m及4.5m。在江苏、湖北、湖南、安徽、广东、天津、山东、山西、陕西、新疆等16个省、市、自治区建成大型轴流泵站共114座，总装机容量63万kW。
- 中文名
- 轴流泵
- 优点
- 流量大等
- 外文名
- Axial flow pump
- 种类
- 立式、卧式、斜式及贯流式数种
区别
区别是一个汉语词汇，有区分;辨别的意思。
- 中文名
- 区别
- 注音
- ㄑㄩ ㄅㄧㄝ ˊ
- 拼音
- qūbié
- 基本解释
- 区分;辨别
题王网让考试变得更简单
扫码关注题王，更多免费功能准备上线！
此试题出现在
As Christmas is coming, there are presents to be bought, cards to be sent, and rooms to be cleaned. Parents are ___1___ with difficult jobs of hiding presents from curious young children. If the gifts are large, this is sometimes a real ___2___. On Christmas Eve, young children find the excitement almost unbearable. They are torn between the wish to go to bed early so that Father Christmas will bring their presents quickly and the wish to stay up late so that they will not miss the fun. The wish for gifts usually proves stronger. But though children go to bed early, they often lie awake for a long time, hoping to get a short ___3___ at Father Christmas. Last Christmas, my wife and I successfully hid a few large presents in the storeroom. I ___4___ the moment when my son, Jimmy, would ask me where that new bike had come from, but ___5___ he did not see it. On Christmas Eve, it took the children hours to go to sleep. It must have been nearly ___6___ when my wife and I went quietly into their room and began filling stockings. Then I pushed in the ___7___ I bought for Jimmy and left it beside the Christmas tree. We knew we would not get much sleep that night, for the children were ___8___ to get up early. At about five o’clock the next morning, we were woken by loud sounds coming from the children’s room — they were shouting excitedly! Before I had time to get out of bed, young Jimmy came riding into the room on his new bike, and his sister, Mary, followed close behind pushing her new baby carriage. Even the baby arrived. He moved ___9___ the hands and knees into the room dragging a large balloon behind him. Suddenly it burst. That woke us up ___10___. The day had really begun with a band! ___8___内应选（）
嘌呤核苷酸从头合成时先合成的前体正确的是（）
什么是列控系统？
孕妇36岁，G1P0，40周妊娠，原发不孕4年，经治疗后妊娠。经B超及临床检查，估计胎儿体重4100g，诊断为高龄初产妇及巨大儿，应选择何种分娩方式（）
简述生态系统学的主要研究内容。
以下哪种方法不是进行眼压测量的：（）
买方或其代表可以对货物进行检验和测试的地点有（）。
喷油提前角
试述WSN的各管理平台。
下列哪项是血液透析的禁忌证（ ）
暂无相关推荐~