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

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• 1Seawater 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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• 2CO2 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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• 3The 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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• 4Fires 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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• 5A tank has been sealed and unventilated(不通风的) for a long period of time. Which of the following conditions does this indicate、

  A.The tank is safe to enter.

  B.The tank is especially dangerous to enter.

  C.Carbon monoxide(一氧化碳) is present.

  D.Water vapor present when the tank was sealed has oxidized(使氧化).

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• 6Now that the valve is not worth ______, I suggest it ______.

  A.to repair/renewing

  B.repairing/renewing

  C.to repair/ be renewed

  D.repairing/be renewed

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• 7When a vessel is in dry-dock, the vessel's engineers should ______.

  A.examine the condition of the propeller

  B.chip and paint all hull protection zincs

  C.install new docking plugs in all cofferdams

  D.inspect the hull for hogging or sagging

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• 8The additional mark ______in the Classification Certificate for Machinery represents the propulsion apparatus is remotely controlled on the navigating bridge control station, and engine room is watched by duty personnel.

  A.BRC

  B.MCC

  C.AUT-0

  D.AUT-1

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• 9Oil Record Book Part I shall be provided to ______.

  A.every oil tanker

  B.every ship of 400 tons gross tonnage and above

  C.every ship

  D.any ship

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• 10“Inability to provide for the first watch at the commencement of a voyage and for subsequent relieving watches persons who are sufficiently rested and otherwise fit for duty.” is considered to be one of the detainable deficiencies(缺乏) under ______.

  A.the SOLAS Convention

  B.the MARPOL Convention

  C.the STCW Convention

  D.the LOAD LINE Convention

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