单项选择题
Course directed by the OSC or CSS to be steered at the beginning of a search is（）.
A.Original course B.Initial course C.Final course D.Designated course
单项选择题 The commander of a rescue unit designated to co-ordinate search and rescue operations within a specified area is the（）.
单项选择题 Stop search and return to（）.
单项选择题 The International Regulations for Preventing Collisions at Sea（）while carrying out search and rescue operation.
