【多选题】【消耗次数:1】
水泵按泵轴安装形式分为()。
A.立式泵
B.离心泵
C.卧式泵
D.混流泵
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相关题目
【多选题】 水泵按泵轴安装形式分为()
①  A、立式泵
②  B、离心泵
③  C、卧式泵
④  D、混流泵
⑤  E、斜式泵
【判断题】 立式轴流泵、卧式轴流泵、斜式轴流泵是按泵轴的安装方向分类的。
①  正确
②  错误
【单选题】 离心泵过滤网安装在( )。
①  进口阀与泵之间
②  泵出口
③  进口阀之前
【判断题】 化工生产中常见的几种离心泵是水泵、杂质泵、气泵。
①  正确
②  错误
【单选题】 离心泵扬程的意义 。
①  A、泵的实际升扬高度
②  B、泵的吸液高度
③  C、液体出泵和进泵的压差换算成的液注高度
④  D、单位重量液体出泵和进泵的机械能差值
【单选题】 启动离心泵前关闭泵出口阀的目的是( )。
①  提高泵出口压力
②  防止吸入管线突然抽空
③  防止系统压力突变
④  减小启动功率
【单选题】 倘若开大离心泵出口阀门,提高泵的输液量,会引起 。
①  A、泵的效率提高
②  B、泵的效率降低
③  C、泵的效率可能提高也可能降低
④  D、泵的效率只决定于泵的结构及泵的转速,与流量变化无关
【单选题】 离心泵的工作点决定于 。
①  A、管路特性曲线
②  B、离心泵特性曲线
③  C、管路特性曲线和离心泵特性曲线
④  D、与管路特性曲线和离心泵特性曲线无关
【单选题】 在某单泵输液的管路中,并联一台同一型号的离心泵,单泵与并联双泵的输液效果为————。
①  并联的输液量将是单泵的两倍
②  并联的扬程将是单泵的两倍
③  并联的能耗将是单泵的两倍
④  并联的输液量、扬程或能耗都不会是单泵的两倍
【判断题】 大型输送泵站都选用卧式混流泵().
①  正确
②  错误
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②  they would arrive
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【单选题】 Louis was asked to ___ the man who stole her purse.
①  confirm
②  recognize
③  claim
④  identify
【单选题】 For thousands of years man dreamed  () seemed impossible dreams about flying.
①  what
②  that
③  which
④  why
【单选题】 ___________ priorities
①  make
②  set
③  establish
④  identify
【单选题】 _______ these honours he received a sum of money.
①  Besides
②  Outside
③  But
④  Except
【单选题】 He didn’t ______ to cause so much unhappiness.
①  extend
②  attend
③  intend
④  tend
【单选题】 The man told me that by the end of the week he _______ away from his hometown for 20 years.
①  has been
②  will have been
③  is to be
④  would have been
【单选题】 Although he did not know London well, he made his way ______ to the airport.
①  easy enough
②  enough
③  easily enough
④  enough easily
【单选题】 The world is trying every means to _____the friendship between the two countries.
①  raise
②  promote
③  arise
④  protest
【单选题】 One rainy night the policeman had a chance _____ with a gang of smugglers.
①  acquaintance
②  encounter
③  account
④  interview