单项选择题
In restricted visibility a towed vessel must sound a fog signal when it is（）.
A.the last vessel in the tow B.the last vessel in the tow and it is carrying a crew C.manned，regardless of its position in the tow D.None of the above are correct
单项选择题 In reduced visibility，you hear two prolonged blasts of a whistle. This signal is sounded by a （）.
单项选择题 In order to maintain speed while changing course from a close reach to a broad reach，the sails should be（）.
单项选择题 In order for a vessel to be engaged in fishing she must be（）.
