The height of a 1-year-old boy is about ?

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• A swift current occurring in a narrow passage connecting two large bodies of water which is produced by the continuously changing difference in height of tide at the two ends of the passage is called a(n)（）.

  A . hydraulic current B . rectilinear current C . rotary current D . harmonic current

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• Which of the following is the reason that the metacentric height is a valid measure of only the initial stabilit?（）.

  A . The metacenter does not remain in the same position for large angles of inclination B . The center of gravity shifts due to inclination C . The center of gravity shifts above the metacenter as the vessel is inclined D . The mean draft will change as the vessel is inclined

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• Normal pool elevation is the height in feet of the section of river above a dam. This height is measured from（）.

  A . low steel on the Huey P. Long Bridge B . mean sea level C . the local water table D . the minimum dam control level

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• The ratio of the height of a vessel’s rudder to its width is referred to as the（）.

  A . aspect ratio B . constriction ratio C . rudder ratio D . steering ratio

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• Mean high water is the average height of（）.

  A . The higher high waters B . The lower high waters C . The lower of the two daily tides D . All high water

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• A swift current occurring in a narrow passage connecting two large bodies of water，which is produced by the continuously changing difference in height of tide at the two ends of the passage，is called a（）.

  A . hydraulic current B . rectilinear current C . rotary current D . harmonic current

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• The daily predictions of the times and heights of high and low water for a selection of Standard Ports are given in（）.

  A . Admiralty Maritime Communications B . Admiralty Tide Tables C . a comprehensive guide for the yachtsman D . ALRS

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• Which of the following will increase the height of the center of buoyancy for your vessel?（）.

  A . Discharging weight from lower decks B . Loading weight in upper decks C . Shifting weight from lower to upper decks D . Shifting weight from upper to lower deck

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• Under normal weather and sea conditions when securing a stack of containers with twist locks，lashings are required when the tier exceeds what height? （）

  A . Lashings are always required B . One container C . Two containers D . Three container

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• Which of the following is the reason that the metacentric height is a valid measure of only the initial stability?（）.

  A . The metacenter does not remain in the same position for large angles of inclination B . The center of gravity shift due to inclination C . The center of gravity shifts above the metacenter as the vessel is inclined D . The mean draft will change as the vessel is inclinded

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• The difference between the heights of low and high tide is the（）.

  A . period B . range C . distance D . depth

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• Mean low water is the average height of（）.

  A . the surface of the sea B . high waters and low waters C . all low waters D . the lower of the two daily low tide

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• The height of the metacenter above the keel will vary depending on the（）.

  A . draft and beam of the ship B . displacement and deadweight of the ship C . buoyancy and trim of the ship D . tonnage and deadweight of the shi

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• A partially full tank causes a virtual rise in the height of the（）.

  A . metacenter B . center of buoyancy C . center of flotation D . center of gravity

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• The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.

  A . mean high water B . mean low water C . half-tide level D . mean sea level

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• Under normal weather and sea conditions when securing a stack of containers with non-locking fittings，lashings are required when the tier exceeds what height?（）.

  A . Lashings are always required B . One container C . Two containers D . Three container

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• How do the height and location of a tug’s towing bitts relate to the danger of tripping?（）

  A . The further forward and closer to amidships the more readily the tug will trip B . Placement further aft permits more effective pulling，better steering and eliminates the danger of tripping C . Installing the bitts down low lowers the center of gravity D . The height and position of towing bitts has no significance

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• The height of a VHF radio antenna is more important than the power output wattage of the radio because（）.

  A . VHF communications are basically line of sight B . the air is more dense the higher you go C . salt water is a poor conductor of sound D . sea water absorbs the radiated energy

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• The height of a wave is the vertical distance（）.

  A . from the still water plane to the crest B . from the still water plane to the trough C . from crest to trough D . between water levels at one-quarter of the wave's length

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• The difference between the height of the metacenter and the height of the center of gravity is known as the（）.

  A . metacentric height B . height of the righting arm C . fore and aft perpendicular D . height of the center of buoyancy

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• The weight of a 1-year-old infant is about ?

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• 99. At a spot where the charted depth is 15 m, and the tidal height is -1.3 m, then the actual depth of the water is ____

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• 129. The average height of the surface of the sea for all stages of the tide over a 19 year period is called _____.

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• 3、一棵有510个结点的完全二叉树的高度为多少？（独根树高度为1) What is the height of a complete binary tree with 510 nodes？ （the height of a tree with only a root is 1)

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