单项选择题
A.12 strands and a two-inch diameter B.12 strands and a two-inch circumference C.6 strands and a two-inch diameter D.6 strands and a two-inch circumference
A “sheepshank” is used to（）.A.keep a line from frayingB...
单项选择题A “sheepshank” is used to（）.
A.keep a line from fraying B.join lines of unequal size C.stop off a line D.shorten a line
（）provide athwartship support for the mast or king post...
单项选择题（）provide athwartship support for the mast or king posts.
A.Shrouds B.King posts C.Stays D.Turnbuckles
（）are used for anchor gear in marine work where the cha...
单项选择题（）are used for anchor gear in marine work where the chains must withstand the corrosive effects of seawater.
A.Chains B.Wires C.Ropes D.Lines
