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【简答题】
如图1-51所示，液压泵从一个大的油抽吸油液，流量为q=150L/min，油液的运动粘度v=34×10 -6 m 2 /s，油液密度P=900kg/m 3 。吸油管直径d=60mm，并设泵的吸油管弯头处局部阻力系数ζ=0.2，吸油口粗滤网的压力损失△p=0.0178MPa。如希望泵入口处的真空度Pb不大于0.04MPa，试求泵的吸油高度H(液面到滤网之间的管路沿程损失可忽略不计)。
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【单选题】Sentences: Direction: Choose the choice that best expresses the highlighted sentence. ( 4x5=20 points, 20% ) Charles Darwin published The Origin of Species. He wrote that life forms change in response...
A.
According to Darwin, particular environments cause life forms to change.
B.
Darwin wrote that life forms change the environments around them.
C.
According to Darwin, change is the essence of life forms.
D.
Darwin wrote that life forms change spontaneously.
【简答题】1) Prof. Williams says that my composition is good except for the end-ing which seems too (). 2) Suffering from insomnia for several days, Ann went to see her doctor and was told that the problem was ...
【单选题】For instance,something uppermost about my father was how he had ________ ______ me from boyhood to love books and reading.
A.
impressed in
B.
impress on
C.
impressed upon
D.
impressed within
【单选题】Which god is said to give birth to theaters and dramas?
A.
Apollo
B.
Dionysus
C.
Hestia
D.
Athena
【简答题】A. consequences B. seemingly C. in contrast to D. Curiosity E. abrupt F. emotional G. genuine H. primarily I. bless J. wear and tear K. sentiments L. dated 1) Prof. Williams says that my composition i...
【单选题】客运索道是指利用动力驱动、柔性绳索牵引箱体等运载工具运送人员的机电设备，包括客运架空索道、客运缆车、客运拖牵索道等。客运索道的运行管理和日常检查、维修是其安全运行的重要保障。下列客运索道安全运行的要求中，正确的是( )。
A.
客运索道每天开始运送乘客之前都应进行三次试运转
B.
单线循环固定抱索器客运架空索道一般情况下不允许夜间运行
C.
单线循环式索道上运载工具间隔相等的固定抱索器，应按规定的时间间隔移位
D.
客运索道线路巡视工至少每周进行一次全线巡视
【简答题】1) Prof. Williams says that my composition is good except for the ending which seems too________. 2) Suffering from insomnia for several days, Ann went to see her doctor and was told that the problem ...
【单选题】Which god is said to give birth to theater and drama?
A.
Apollo
B.
Dionysus
C.
Hestia
D.
Athena
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