单项选择题
A.strips of burlap B.heavy paper C.dunnage boards D.strips of rope yarn
The tackle that raises and lowers the boom is（）.A.the c...
单项选择题The tackle that raises and lowers the boom is（）.
A.the cargo fall B.The cargo hoisting wire rope C.the topping lift D.the cargo whip
The strongest of the natural fiber ropes is（）.A.NylonB....
单项选择题The strongest of the natural fiber ropes is（）.
A.Nylon B.Dacron C.Manila D.Sisal
The square knot is used for（）.A.forming temporary eyes ...
单项选择题The square knot is used for（）.
A.forming temporary eyes in lines B.joining two lines of equal size C.keeping line from unlaying or fraying D.joining two lines of different size
