單項選擇題A plane that cuts the Earth’s surface and passes through the poles will always form().

A.the equator
B.a loxodromic curve
C.a small circle
D.a meridian


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1.單項選擇題A plane perpendicular to the polar axis will never form what line on the Earth’s surface? ()

A.Great circle
B.Equator
C.Small circle
D.Meridian

2.單項選擇題A parallel of latitude other than the equator is a().

A.great circle
B.loxodromic curve
C.small circle
D.gnomonic curve

3.單項選擇題A nun buoy will().

A.be green in color
B.have an even number
C.be left to port when entering from seaward
D.be cylindrical in shape

4.單項選擇題A mid-channel buoy,if lighted,will show a().

A.fixed red light
B.Morse (A) white light
C.green light
D.flashing red light

5.單項選擇題A line on the Earth parallel to the equator is a().

A.gnomonic curve
B.small circle
C.meridian
D.great circle