单项选择题

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

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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
单项选择题
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
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