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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单项选择题

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

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