單項(xiàng)選擇題

A preferred-channel buoy will show a（）.

A.white light whose characteristic is Morse (A)
B.group-occulting white light
C.composite group-flashing (2 + 1) white light
D.composite group-flashing (2 + 1) red or green light

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單項(xiàng)選擇題

A preferred-channel buoy may be（）.

A.lettered
B.spherical
C.showing a white light
D.All of the above

單項(xiàng)選擇題

A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.

A.the equator
B.a great circle
C.a small circle
D.a meridian