单项选择题
Safe water buoys may show ONLY（）.
A.flashing red lights B.flashing green lights C.white lights D.yellow lights
单项选择题 On cargo and miscellaneous vessels what is NOT a required part of the fireman’s outfit?（）
单项选择题 On a vessel making a voyage more than 48 hours long，regulations require that（）.
单项选择题 On a small boat，which knot is best suited for attaching a line to the ring of an anchor?（）
