单项选择题
A schooner is a fore-and-aft rigged vessel with（）.
A.a single mast B.two masts: with the mizzen stepped abaft the rudder post C.two masts: with the mizzen stepped forward of the rudder post D.at least two masts: a foremast and a mainmast
单项选择题 A sail hook is used for（）.
单项选择题 A safety feature provided on all inflatable liferafts is（）.
单项选择题 A note of protest is a declaration made by the Master of a vessel before a notary public.Its purpose is to（）.
