单项选择题
A spring line is a（）.
A.mooring line made of spring lay wire rope B.mooring line running diagonally to the keel C.mooring line parallel to the keel D.wire rope used for securing an anchor buoy
单项选择题 A six-strand composite rope made up of alternate fiber and wire strands around a fiber core is called（）.
单项选择题 A rope made of a combination of wire and fiber is known as（）.
单项选择题 A permanent chain chasing system is used to（）.
