A.anchor the boat
B.pick up heavy loads
C.protect fiber rope from abrasion
D.strengthen mooring lines
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A.for portable fenders
B.for ground tackle
C.on the inside of the hawsepipe
D.on mooring lines
A.a factor of safety
B.additional strength
C.a distribution of the towing load
D.All of the above
A.the total weight in air of the casing string is removed from the ship
B.the hook load (weight of the casing string) is removed from the ship
C.the weight of the casing inside the riser is removed from the ship
D.the weight of the casing string added to the weight of the fill-up mud is removed from the ship
A.equal to the chains they are connecting
B.25% more than the chains they are connecting
C.50% more than the chains they are connecting
D.100% more than the chains they are connecting
A.half the breaking strength of the mooring line
B.the full breaking strength of the mooring line
C.the maximum expected tension of the mooring line
D.50% over the working tension of the mooring line
最新試題
The only wire rope termination which may be made in the field is（）.
A tackle by which the outer end of a boom is raised and lowered is the topping（）.
If kinking results while wire rope is being coiled clockwise，you should（）.
A whipping is（）.
If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor（）.
The main function of the core of a wire rope is to（）.
In securing a towing cable，consideration must be given to letting go in an emergency. The possible whip of towlines when released can be overcome by（）.
Limit switches on gravity davits should be tested by（）.
Cribbing is（）.
The purpose of a devil’s claw is to（）.