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() neutralizes the acid conditions and() cleanses the ri

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  • 【名词&注释】

    摩擦力(friction)

  • [单选题]() neutralizes the acid conditions and() cleanses the rings and grooves.

  • A. The detergency;the alkalinity
    B. The alkalinity;the detergency
    C. The inhabitant;the water
    D. The additives;the distilled water

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  • [单选题]操舵轻快、航向失控的原因可能是()。Ⅰ.舵承配合间隙过大;Ⅱ.舵承损坏;Ⅲ.舵叶丢失;Ⅳ.舵杆折断;Ⅴ.舵承的摩擦力小。
  • A. Ⅰ+Ⅱ
    B. Ⅰ+Ⅳ+Ⅴ
    C. Ⅱ+Ⅳ+Ⅴ
    D. Ⅲ+Ⅳ

  • [单选题]Failure of fuel injection is usually due to trouble in the ().
  • A. exhaust valves
    B. mechanical lubricators
    C. cooling water pumps
    D. fuel injection pum

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