单项选择题
Course directed by the 0SC 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 Engine room is（）fire.
单项选择题 Floating, caused by winds and current with a determinable direction defines（）.
单项选择题 Floating, not controlled, without a clearly determinable direction means（）.
