单项选择题
A.Whether she is normally a fishing or a trawling vessel
B.Her gross tonnage
C.Her length
D.The type of gear she carries
单项选择题 A power driven vessel when towing and the length of the tow exceeds 200 meters shall exhibit during daylight hours where they can best be seen which of the following shapes? （）
单项选择题 A fog signal consisting of one prolonged blast followed by four short blasts would indicate thepresence of a（）.
单项选择题 A flashing light is a light that（）.