单项选择题

A.the centerline of a navigable channelB.the starboard ……

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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热门试题

单项选择题A rapid rise or fall of the barometer indicates（）.

A.heavy rain within six hours
B.a decrease in wind velocity
C.a change in the present weather conditions
D.that fog will soon set in

单项选择题A radar range to a small，charted object such as a light will provide a line of position in which form? （）

A.Straight line
B.Arc
C.Parabola
D.Hyperbola

单项选择题A quick and rapid motion of a ship in a seaway is an indication of a(n) （）.

A.large GM
B.high center of gravity
C.excessive free surface
D.small GZ

单项选择题A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases? （）

A.In the lower level of the pumproom
B.In the middle level of the pumproom
C.In the upper level of the pumproom
D.On the deck outside the pumproom

单项选择题A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. By comparing these two temperature readings with a set of tables you can determine the （）.

A.atmospheric pressure
B.wind speed
C.relative humidity and dew point
D.wind chill factor