1. What does the red sector of a light in the chart indicate if it shows a flashing white and red sector?    (     )

A Safe area                        C danger area

B Limit of navigation channel      D identity of a recommended route

2. It is a type of projection in which points on the su***ce of a sphere of spheroid are conceived as project by radial lines from any point on the su***ce to a plane tangent to the antipode of the point of project.   (      )

A Conic projection                 C stereographic projection

B Gnomonic projection              D polyconic projection