A tank has been sealed and unventilated(不通风的) for a long period of time. Which of the following conditions does this indicate、

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• 1After the order ' ______' is given, the air system is shut down, the turning gear put in.

  A.Finished With Engine

  B.Stop The Engine

  C.Stand-by Engine

  D.Slow-down Engine

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• 2Bridge orders must be ______and a record of any required changes in speed and direction should be kept.

  A.slowly carried away

  B.carried out with a period of delay

  C.promptly carried out

  D.paid by the captain

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• 3Before “stand by” is rung on the engine telegraph, it is usual to give the main diesel engine a brief trial ______ahead and astern.

  A.with power

  B.on power

  C.with air

  D.on air

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• 4When there is a fire in a large electric motor, normally the very FIRST step is to ______.

  A.secure the electric supply

  B.ventilate area to remove smoke

  C.start the fire pump and lead out hose

  D.apply foam

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• 5When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is ______.

  A.lagging

  B.leading

  C.maximum

  D.minimum

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• 6Fires involving combustible metals are classified as ______.

  A.class 'A' fires

  B.class 'B' fires

  C.class 'C' fires

  D.class 'D' fires

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• 7The three basic components of a fire are chain reaction, heat, fuel, and ______.

  A.carbon monoxide

  B.oxygen

  C.carbon dioxide

  D.any gaseous substance

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• 8CO2 extinguishes a fire by __________.

  A.a blanket of bubbles formed on the surface of the fire

  B.smothering

  C.isolating the heat from the fuel

  D.cooling

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• 9Seawater may be used for drinking water ______.

  A.at a maximum rate of two ounces(盎司) per day

  B.after mixing with an equal quantity of fresh water

  C.if gather during or immediately after a hard rain

  D.under no circumstance

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• 10Obviously, for a given fuel oil, its pour point is ______its cloud point.

  A.lower than

  B.higher than

  C.as same as

  D.better than

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