單項選擇題Two navigational hazards are located near to each other，but each is marked by an individual cardinal buoyage system. The buoys of one cardinal system may be identified from the other system by（）.

A.the differing light colors
B.one system having odd numbers while the other system has even numbers
C.one system using horizontal bands while the other system uses vertical stripes
D.the difference in the periods of the light


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1.單項選擇題This is（）where we shall anchor.

A.the light-house
B.the anchorage
C.the pilot station
D.the light-buoy

2.單項選擇題There is sufficient anchorage for（）at all time around the No.1 buoy and for smaller vessels around the No.4 buoy.

A.deep laded vessels
B.deeply load vessels
C.deep loading vessels
D.deeply loaded vessels

3.單項選擇題The shortest distance between any two points on earth defines a（）.

A.small circle
B.great circle
C.rhumb line
D.hyperbola

4.單項選擇題The positions and characteristics of lights and buoys shown within the port area are（）.

A.untrue
B.impossible
C.suspectful
D.unimportant

5.單項選擇題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