默认题库 - 航路指南

单选题

The Sailing Directions contain information on （）.

A. required navigation lights
B. lifesaving equipment standards
C. casualty reporting procedures
D. currents in various locatio

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单选题

A pilot vessel may continue to sound an identity signal if she is （）.

A. underway，but not making way
B. aground
C. being towed
D. not engaged in pilotage duty

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单选题

Above-normal tides near the center of a hurricane maybe caused by the （）.

A. high barometric pressure
B. jet stream
C. storm surge
D. torrential rai

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单选题

An occulting light is one in which （）.

A. the period of darkness exceeds the period of light
B. there is only a partial eclipse of the light
C. the periods of light and darkness are equal
D. the period of light exceeds the period of darkne

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单选题

During a period of whiteout，you should expect which of the following（）.

A. Snowfall or blowing snow
B. Lack of ability to estimate distance
C. Harsh contrast between sun-illuminated snow cover and the background
D. Hazy horizons with extensive mirage effect

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单选题

The Earth has the shape of a(n) （）.

A. sphere
B. oblate spheroid
C. spheroid of revolution
D. oblate eggoid

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单选题

The height of eye correction is smaller than geometrical dip because of （）.

A. the angle between the horizontal and the line of sight to the visible horizon
B. index error
C. parallax
D. terrestrial refractio

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单选题

The height of tide is the （）.

A. depth of water at a specific time due to tidal effect
B. difference between the depth of the water and the area's tidal datum
C. difference between the depth of the water and the high water tidal level
D. difference between the depth of the water at high tide and the depth of the water at low tide

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单选题

The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.

A. difference in longitude
B. mid-longitude
C. departure
D. meridian angle

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单选题

The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.

A. air gap
B. freeboard
C. penetration
D. water depth

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