单项选择题
A.deep laded vessels B.deeply load vessels C.deep loading vessels D.deeply loaded vessels
The shortest distance between any two points on earth d...
单项选择题The shortest distance between any two points on earth defines a（）.
A.small circle B.great circle C.rhumb line D.hyperbola
The positions and characteristics of lights and buoys s...
单项选择题The positions and characteristics of lights and buoys shown within the port area are（）.
A.untrue B.impossible C.suspectful D.unimportant
The period of a lighted aid to navigation refers to the...
单项选择题The period of a lighted aid to navigation refers to the（）.
A.date of construction or establishment B.length of time between flashes of the light C.time required for the longest flash of each cycle D.time required for the light to complete each cycle
