单项选择题

Which buoy will NOT display white retro reflective material（）.

A.Safe water mark
B.Isolated danger mark
C.Preferred channel mark
D.Daymark of no lateral significance

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单项选择题

When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.

A.The objects lie in a straight line
B.The vessel is inside of a triangle formed by the objects
C.The vessel is outside of a triangle formed by the objects
D.A circle will pass through your position and the three objects

单项选择题

When navigating a vessel，you（）.

A.Can always rely on a buoy to be on station
B.Can always rely on a buoy to show proper light characteristics
C.Should assume a wreck buoy is directly over the wreck
D.Should never rely on a floating aid to maintain its exact position

单项选择题

When latitude and longitude are used，these shall be expressed in（）（and decimals of a minute if necessary），north or south of the Equator and east or west of Greenwich.

A.Fathoms and meters
B.Miles and kilometers
C.Arc and degrees
D.Degrees and minutes