Great care is dedicated to the removal of _____ from the scavenge air.

试卷相关题目

• 1Most marine biological sewage treatment plants consist of all the following statements except ______.

  A.aeration tanks

  B.settling tanks

  C.disinfection agent

  D.anaerobic bacteria (厌氧菌)

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• 2The oil sludge is burnt in the ______onboard. I’ll show you the ashes.

  A.boiler

  B.main engine

  C.auxiliary engine

  D.incinerator

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• 3Which is the pollution prevention equipment、

  A.booster pump

  B.evaporator

  C.incinerator

  D.cooler

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• 4When started, a complete oily water separating unit is first filled______. The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.

  A.with dirty water

  B.with clean water

  C.by oily water

  D.by mixed water

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• 5Oily water separators are used to ensure that ships don't discharge oil when pumping out ______.

  A.ballast water

  B.boiler water

  C.bilge water

  D.sewage water

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• 6Dirty oil must be _____ before being used again.

  A.mixed with clean oil

  B.purified

  C.heated

  D.strained

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• 7When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and ___ the sea water passing through the tubes.

  A.dispose

  B.dissolve

  C.heat

  D.dissipates

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• 8When securing a flash-type evaporator for an extended period of time, you should ______.

  A.fill the unit with saltwater

  B.fill the unit with descaling compound

  C.completely drain the unit

  D.tightly seal the unit to exclude air

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• 9Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled、

  A.hydraulic pumps

  B.valves

  C.hydraulic cylinders

  D.hydraulic motors

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• 10Positive displacement, helical gear(斜齿轮) 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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