A whistle signal of one prolonged，one short，one prolonged and one short blast，is sounded by a vessel（）.

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• The abandon ship signal sounded by the vessels whistle is （）.

  A . 6 short blasts and 1 long blast B . long blast mare than 6 short blasts C . more than 6 short blasts and 1 long blast D . 1 long blast of at least 10 second

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• One of the signals，other than a distress signal，that can be used by a vessel to attract attention is a(n)（）.

  A . red star shell B . searchlight C . burning barrel D . orange smoke signal

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• If you hear more than six short blasts and one long blast of the whistle supplemented by the same signal on the general alarm，you should（）.

  A . start the fire pump B . go to your man overboard station C . go to your lifeboat station D . stand by for collisio

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• One of the signals，other than a distress signal，that can be used by a rescue boat to attract attention is a/an（）.

  A . red star shell B . searchlight C . burning barrel D . orange smoke signal

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• Which radiotelephone signal indicates receipt of a distress message?（）

  A . Roger wilco B . Romeo，romeo，romeo C . SOS acknowledged D . Mayday roger

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• If you hear a continuous blast of the ship’s whistle for a period of a period of not less than 10 saconds supplemented by a continuous ringing of the general alarm bells for not less than 10 seconds,you should go to your（）.

  A . boat station B . fire station C . man overboard station D . collision statio

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• When whistle signals are used for launching lifeboats，one short blast means（）.

  A . use the float-free method only B . lower all boats C . raise all boats D . drill is over，secure all boat

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• While reading the muster list, you see that "three short blasts on the ships whistle and the same signal on the general alarm bells" is the signal for （）.

  A . abandon ship B . dismissal from drills C . fire and emergency D . man overboard

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• The emergency signal for fires is sounded on the ship’s whistle and general alarm as（）.

  A . a continuous ringing for 10 seconds B . one short ring followed by one long ring C . two long rings of at least 20 seconds D . a continuous ringing until the fire is extinguished

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• In the International Code of signals，a group of three letters indicates（）.

  A . urgency or an emergency B . the vessel's national identity signal C . a group from the general signal code D . a group from the medical signal code

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• The duration of a prolonged blast of the whistle is（）.

  A . 2 to 4 seconds B . 4 to 6 seconds C . 6 to 8 seconds D . 8 to 10 second

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• While underway，in fog，you hear a whistle signal of one prolonged blast followed by two short blasts. This signal is sounded by a vessel（）.

  A . not under command B . being towed C . on pilotage duty D . aground

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• A light signal consisting of three flashes means （）.

  A . I am in doubt as to your actions B . My engines are full speed astern C . I desire to overtake you D . I am operating astern propulsio

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• In the emergency alarm signals, if the alarm or whistle two long sounds followed by one short sound for 1 minute, it is the （） emergency.

  A . fire fighting B . leakage blocking C . abandon ship D . integratio

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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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• When you hear three short blasts on the ships whistle and the same signal on the general alarm bells, you （）.

  A . are required to go to your life-raft B . are dismissed from drills C . should point to the man overboard D . should start the fire pum

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• A list signal of one white light indicates that the vessel is （）.

  A . on an even keel B . listing about 1° to the side the light is displayed on C . listing over 5° With the light displayed on the high side D . listing，and the chutes should be directed to the side where the light is displayed

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• A signal of one prolonged，one short，one prolonged，and one short blast，in that order is given by a vessel（）.

  A . engaged on pilotage duty B . in distress C . at anchor D . being overtaken in a narrow channel

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• If you hear more than six short blasts and one long blast of the whistle supplemented by the same signal on the general alarm,you should（）.

  A . start the fire pump B . go to your man overboard station C . go to your lifeboat station D . collision statio

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• A sound signal of seven short blasts and one long blast given with the vessel’s sound system is（）.

  A . Safety alarm B . Distress alarm C . Fire drill alarm D . General emergency alarm

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• When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.

  A . 10 minutes B . 1 minute C . 1 hour D . 3 minute

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• Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and（）refers to call issues that cause variations in timing or time of arrival. 

  A .  echo B .  jitter C .  packet loss D .  digitized sampling

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• When two vessels are in sight of one another and NOT in or near an area of restricted visibility，any of the following signals may be given EXCEPT（）.

  A . a light signal of at least five short and rapid flashes B . one prolonged，one short，one prolonged，and one short whistle blasts C . four short whistle blasts D . two short whistle blast

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• Passage 1Its one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect chemical signals released f

  A、 mice s inborn terror of cats B、 the evolution of Toxoplasma C、 a new study about the effects of a parasite on mice D、 a harmful parasite called Toxoplasma gondii

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