单项选择题
A chart projection depicting the poles and a small area on either side of a connecting meridian，that is sometimes used for star charts，is the（）.
A.azimuthal gnomonic projection B.Lambert conformal projection C.transverse Mercator projection D.polyconic projection
单项选择题 A chart position enclosed by a square is a(n)（）.
单项选择题 A change of a documented vessel’s name can only be made by the（）.
单项选择题 A chain bridle is used when towing astern because it（）.
