【单选题】【消耗次数:1】
液压泵在正常工作时,其工作压力应( )泵的额定压力。
大于或等于
小于或等于
等于
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相关题目
【单选题】 液压泵在正常工作时,其工作压力应( )泵的额定压力。
①  大于或等于
②  小于或等于
③  等于
【单选题】 刀开关的( )应等于或大于电路额定电压,其额定电流应等于或稍大于电路的工作电流。
①  额定电压
②  动作电压
③  实际电压
④  电压
【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
【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
【判断题】 在选用保险丝时,应使额定电流等于或稍小于电路中的最大正常工作电流。
①  正确
②  错误
【判断题】 差压式变量泵和节流阀的调速回路,泵输出流量与负载流量 相等 ,泵的工作压力等于 负载压力 加节流阀前后压力差,故回路效率高。
①  正确
②  错误
【单选题】 液压系统中,工作压力不正常表现在工作压力建立不起来,或工作压力升不到调定值,致使液压系统不能正常工作,甚至运动件处于原始位置不动。该说法( )
①  正确
②  错误
【判断题】 在Excel2010中输入公式时,大于或等于符号是用≥表示,小于或等于符号是用≤表示。 ( )
①  正确
②  错误
【单选题】 叶片泵的结构较齿轮泵复杂,但其工作压力较高,且流量脉动小,工作平稳,噪声小,寿命较长。该说法( )
①  正确
②  错误
【判断题】 机构处于死点位置时,其传动角等于900,压力角等于00。()
①  正确
②  错误
随机题目
【单选题】 A British man who ____ to play practical jokes ____ his own humorous art work in four major New York museums over the last two weeks.
①  liked;hassecretlyhung
②  likes;hassecretlyhung
③  hadliked;secretlyhung
④  hasliked;secretlyhung
【单选题】 ——Are you content with her lecture? ——Nowhere near that. It ____.
①  mayhavebeengood
②  couldn’thavebeenworse
③  couldn’thavebeenworse
④  mustbebetter
【单选题】 Experience is believing. If you’d like to know what it ____ like to be a soldier in World War Ⅱ,____ the game “Brothers in Arms: Roads to Hill 30”.
①  wouldbe;try
②  wouldbe;try
③  wouldbe;trying
④  was;trying
【单选题】 Nothing in my life has meant ____ to me as his praise.
①  asmuch
②  more
③  thatmuch
④  asgood
【单选题】 After the 1980s, the West became Godlike to many Chinese because of ____ Westerners’ wealth, and ____ freedom to do what they wanted.
①  /;/
②  the;the
③  the;/
④  /;the
【单选题】 Shanghai is the first city in the world ____a high-speed maglev train, from the city to Pudong Airport.
①  tobuild
②  tobebuilt
③  tohavebuilt
④  tohavebeenbuilt
【单选题】 The size of the generation gap seems to be spreading with ____ rapid changes in technology, in education, in transportation and in communication that are taking place all over ____ globe.
①  the;the
②  the;/
③  /;/
④  /;the
【单选题】 Never in my wildest dreams ____ lead to a career in the NBA, which has allowed me to give back to my people in Africa.
①  Ithoughtthechancewould
②  Ithoughtwouldthechance
③  didIthinkthechancewould
④  didIthinkwouldthechance
【单选题】 Small as it is, the ant is as much a creature as ____ all other animals on the earth.
①  are
②  is
③  have
④  do
【单选题】 She’s fainted. Throw some water on her face and she’ll ____.
①  comeround
②  comealong
③  comeon
④  comeout