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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相关考题
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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 -
单项选择题
A light signal consisting of three flashes means （）.
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
