单项选择题
A whipping on a fiber line（）.
A.keeps the ends from fraying B.strengthens it C.protects your hands D.becomes part of a splice
单项选择题 A whipping is（）.
单项选择题 A tackle by which the outer end of a boom is raised and lowered is the topping（）.
单项选择题 A stopper used in securing the ground tackle for sea that consists of a grab attached to a turnbuckle is a（）.
