单项选择题
A ketch is a sailing vessel with（）.
A.one 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.two masts: a foremast and a mainmast
单项选择题 A gypsy or gypsyhead is a（）.
单项选择题 A flounder plate，on a topping lift，is（）.
单项选择题 A face line is used to（）.
