单项选择题
A.raise the boom B.raise the hook C.raise the boom and hook D.check the boom stop
The rope which is the lightest is（）.A.manilaB.nylonC.po...
单项选择题The rope which is the lightest is（）.
A.manila B.nylon C.polypropylene D.dacron
The rope which is rove from the truck to be used with a...
单项选择题The rope which is rove from the truck to be used with a bos’n chair is called a（）.
A.gantline B.life line C.strop D.whip
The rolling hitch could be used to（）.A.join two lines o...
单项选择题The rolling hitch could be used to（）.
A.join two lines of different sizes B.join two lines of equal sizes C.add strength to a weak spot in a line D.act as a stopper to transfer a line under strain
