【单选题】【消耗次数:1】
液压泵是向液压系统提供一定流量和压力的油液的动力元件。该说法( )
正确
错误
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相关题目
【判断题】 液压泵在公称压力下的流量就是液压泵的理论流量。
①  正确
②  错误
【单选题】 液压系统温度过高,油液粘度显著下降,泄露加剧,液压泵及整个液压系统效率显著降低。该说法( )
①  正确
②  错误
【单选题】 齿轮泵是液压系统中广泛采用的一种液压泵该说法( )
①  正确
②  错误
【单选题】 液压泵是容易产生气穴现象的主要元件。该说法( )
①  正确
②  错误
【单选题】 液压泵的噪声大小与液压泵的种类、结构、大小、转速以及工作压力等很多因素有关。该说法( )
①  正确
②  错误
【单选题】 为了改变进入液压执行元件的流量,可采用变量液压泵来供油,也可采用定量泵和流量控制阀,以改变通过流量阀流量的方法。该说法( )
①  正确
②  错误
【单选题】 液压泵吸油口的真空度由三部分组成:①把油液提升到一定高度所需的压力。产生一定的流速所需的压力。吸油管内压力损失。该说法( )
①  正确
②  错误
【单选题】 ( )元件向液压系统提供压力油,将电机输出的机械能转换为油液的压力能。
①  动力
②  执行
③  控制
④  辅助
【单选题】 ( )元件向液压系统提供压力油,将电机输出的机械能转换为油液的压力能。
①  动力
②  执行
③  控制
④  辅助
【判断题】 液压泵的实际流量比理论流量 小  ;而液压马达实际流量比理论流量 大  。
①  正确
②  错误
随机题目
【单选题】 All medicines should be kept out of____ of children.
①  touch
②  reach
③  get
④  attain
【单选题】 Every year, one student in our high school wins a scholarship that ____one year of college.
①  improves
②  subsidizes
③  obliges
④  inflicts
【单选题】 A talk on developments in science and technology_______in the school hall next week.
①  given
②  will be given
③  has been given
④  give
【单选题】 As to Grosvenor and Scott, she____ never to meet them again.
①  resolved
②  decide
③  determine
④  involved
【单选题】 I’ d like to start by____ myself to countries where English is the main language.
①  controlling
②  containing
③  restraining
④  restricting
【单选题】 I won’t apply for the job. I hear that they’re quite ____ about their personnel.
①  particular
②  especially
③  special
④  peculiar
【单选题】 Tom has been a vegetarian ____ principle for years.
①  in
②  on
③  for
④  by
【单选题】 His manner was so pleasant that Bolla felt at ____ with him at once.
①  peace
②  large
③  ease
④  best
【单选题】 Research findings show we spend about two hours dreaming every night, no matter what we _________ during the day.
①  must have done
②  would have done
③  should have done
④  may have done
【单选题】 Joseph was very lucky ____ with his life; he almost did not get out of the room.
①  to escape
②  to have escaped
③  to escaping
④  to be escaping