A.the light-houseB.the anchorageC.the pilot stationD.th……

单项选择题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

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

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

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

单项选择题The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen（）.

A.under existing visibility conditions
B.under perfect visibility
C.with ten miles visibility
D.with fifteen miles visibility