A.the rotation of the earth on its axis
B.convection currents caused by differences in radiant heating between equatorial and polar regions
C.mountain ranges
D.All of the above
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A.the letters ICW after the aid's number or letter
B.yellow stripes，squares，or triangles marked on them
C.white retroreflective material
D.the light characteristic and color for lighted aids
A.Bayou Sara
B.Baton Rouge
C.Head of Passes
D.Red River Landing
A.Thimble Shoal Main Channel or the South Auxiliary Channel
B.Any of the channels but keep to the right hand side
C.The South Auxiliary Channel
D.Thimble Shoal Main Channel
A.Any span is navigable
B.Northbank or Southbank
C.Southbank span only
D.Northbank span only
A.Right Descending Bank span
B.Left Descending Bank span
C.Center span
D.Water is equal under all spans
最新試題
All towing vessels of 26 feet or longer while navigating are required to carry which item? （）
An example of a grade B product is（）.
An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.
All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.
An azimuth angle for a body is measured from the（）.
An airplane should NOT send which signal in reply to a surface craft?（）
All personnel on board a vessel should be familiar with the rescue boat’s（）.
An entry of water，gas，oil，or other formation fluid into the wellbore is called a（）.
An “on-load” release system on a survival craft means the cable can be released（）.
An icebreaker assisting a vessel through an ice field would display a visual signal consisting of the code letter “E” (Echo) to signify that “（）”.