单项选择题
A metal object on the pier resembling a tree stump and made to receive mooring lines is a（）.
A.bight B.bollard C.chock D.camel
单项选择题 A metal eye spliced into a wire is called a（）.
单项选择题 A ketch is a sailing vessel with（）.
单项选择题 A gypsy or gypsyhead is a（）.
