A safe water daymark has what shape? （）

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• On entering from seaward，a starboard side daymark will（）.

  A . show a fixed red light if lighted B . show a Morse (A) white light C . be square in shape D . have an even number if numbered

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• （）gives a description of the combined Cardinal and Lateral Buoyage system including textual and diagrammatic explanations of the five types of marks;lateral;cardinal,isolated danger;safe water and special marks.

  A . Ocean Passages for the World B . Symbols and Abbreviations used on Admiralty Charts，Chart 5011 C . IALA Maritime Buoyage System D . The Mariners Handbook

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• A red triangular daymark marks （）.

  A . the centerline of a navigable channel B . the starboard side of a channel C . a prominent object of navigational interest that has no lateral significance D . an area of a channel where passing another vessel is permitted

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• A liferaft which has inflated bottom-up on the water（）.

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• What is a lighted safe water mark fitted with to aid in its identification（）.

  A . A spherical topmark B . Red and white retroreflective material C . A sequential number D . A red and white octago

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• The （）has a water damp ring.

  A、100% B、1/2 C、1/5 D、1/3

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• After a fire has been extinguished in a closed space, personnel may safely enter the space when （）.

  A . smoke density has been decreased sufficiently to see the bulkhead opposite the compartments entrance B . a lifeline and explosion proof flash light are used C . all smoke and toxic fumes are removed and an adequate oxygen supply is present D . overhaul has been completed to remove any possible source of re-ignitio

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• How is a safe water mark，that can be passed close aboard on either side，painted and lighted?（）

  A . Black and white stripes with an interrupted quick flashing light B . Black and red stripes with a Morse (A) light C . Black and red stripes with an interrupted quick flashing light D . Red and white stripes with a Morse (A) light

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• Safe water buoys may show ONLY（）.

  A . flashing red lights B . flashing green lights C . white lights D . yellow light

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• A special daymark is a（）.

  A . red-and-white octagon B . daymark with a yellow stripe on it C . green square D . yellow diamond

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• 253. A red triangular daymark marks _______.

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