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單項選擇題

A list man would expect to see any of the following light signals except （）.

A.two red lights
B.one green light
C.one white light
D.one amber light

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單項選擇題

A line of position from a celestial observation is a segment of a （）.

A.circle of equal altitude
B.parallel of declination
C.parallel of altitude
D.vertical circle

單項選擇題

A line of position derived from a loran reading is a section of a(n) （）.

A.straight line
B.arc
C.parabola
D.hyperbola

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