单项选择题
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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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 -
单项选择题
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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A light used to signal passing intentions must be an （）.
A.all-round yellow light only
B.all-round white light only
C.all-round blue light only
D.alternating red and yellow light
