Continuous short buzzes on the telephone indicate that the line is busy after you dial the telephone number.

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• After putting on a self-contained breathing apparatus，you open the air supply and hear a continuous ringing of a bell. What does this mean? （）

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• In a crossing situation on international waters, a short blast by the give-way vessel indicates that the vessel（）.

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• If a refrigeration compressor is short cycling on high head pressure, you should （）.

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• A continuous watertight bulkhead on a ship is normally also a(n)（）.

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• While working in the engine room, you hear seven short blasts followed by one long blast on the ships whistle, supplemented by the same signal on the general alarm bellsYou should （）.

  A . start the fire pump to charge the fire main B . standby the main console and await orders from the engineer on watch C . go to your fire station D . go to your lifeboat statio

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• Her early albums ＿ a peak in a decade which was not short on agency.

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