Positive displacement, helical gear pumps are well suited for pumping oil becauseA.stuffing boxes eliminate the leakage problems usually associated with other gear pumpsB.it is not necessary to closely maintain design clearances with this pumpC.they are e

题目

Positive displacement, helical gear pumps are well suited for pumping oil because

A.stuffing boxes eliminate the leakage problems usually associated with other gear pumps

B.it is not necessary to closely maintain design clearances with this pump

C.they are essentially self-priming and produce a high suction lift

D.these pumps are designed with extreme tooth angles

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1.oil—water partition coefficient

2.I saw your man not operating the winch gear ______ gear．A.inB.byC.ofD.against

3.A mercurial barometer at sea is subject to rapid variations in height ("pumping") due to the pitch and roll of the vessel. To avoid this error，measurements of atmospheric pressure at sea are usually measured with a(n) ______.A.syphon barometerB.cistern barometerC.aneroid barometerD.fortin barometer

4.The disinfection of various compartments in a vessel by filling with a gaseous agent to destroy rats and all insects pests which act as germ carriers means ______.A.fumigationB.dischargingC.CompensationD.displacement

更多“Positive displacement, helical gear pumps are well suited for pumping oil becauseA.stuffin ”相关问题

  • 第1题：

    ______:the vertical distance measured on the vessel’s side amidships from the load water line to the upper side of the freeboard deck or a point corresponding to it.

    A.Buoyancy

    B.Freeboard

    C.Draft

    D.Displacement


    正确答案：B
    船中部从载重水线垂直测量到干舷甲板上边缘或相应的点的距离叫干舷。

  • 第2题：

    __________makes it possible for language users to overcome the limitations of time and space in communication.

    A．Arbitrariness
    B．Duality
    C．Productivity
    D．Displacement

    答案：D
    解析：
    考查语言的结构特征。此题句意是：能够使语言的使用者在交流中克服时间和空间的局限性体现了语言的什么特征 语言的移位性(Displacement)是指人类语言可以让使用者在交际时用语言符号代表时间上和空间上不可及的物体、时间和观点。故D正确。

  • 第3题：

    If the function of language is limited to communication, then animals' calls can also be called language, but actually they are not. Compared with traffic light system, language is far more complicated and resourceful. This reflects that language has the feature of__________.

    A.arbitrariness
    B.finiteness
    C.creativity
    D.displacement

    答案：C
    解析：
    考查语言学知识。如果语言的功能仅限于交流，那么动物的叫声也可以称作语言，但事实并非如此。交通灯系统仅能传递简单的信息，而语言则要比这复杂的多。所有这些都是因为语言的二重性和递归性使得人类可以创造出数量无限的句子来传递无限的信息，这都体现了语言的创造性，故选C。

  • 第4题：

    If a hurricane several hundred miles away is moving in your general direction your barometer would ______.

    A.start to rise rapidly

    B.start to fall gradully

    C.rise slowly, begin “pumping” and then start a slow, steady fall

    D.remain steady


    正确答案：B
    台风靠近你你的气压将逐渐减小。

  • 第5题：

    Language enables its speakers to refer to all kinds of things, which are either present or absent; either existing at present, in the past or in the future; either real or unreal. This quality is called__________.

    A．arbitrariness
    B．duality.
    C．creativity
    D．displacement

    答案：D
    解析：
    考查语言的结构特征。语言的移位性(displacement)是指人类语言可以让使用者在交际时用语言符号代表时间上和空间上不可及的物体、时间和观点。

  • 第6题：

    GEAR路由协议不适合在移动WSN使用。


    正确

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