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

单项选择题

A.all-round yellow light only
B.all-round white light only
C.all-round blue light only
D.alternating red and yellow light

单项选择题

A.I am in doubt as to your actions
B.My engines are full speed astern
C.I desire to overtake you
D.I am operating astern propulsion