单项选择题

Back-up wires on a towed vessel provide（）.

A.a factor of safety
B.additional strength
C.a distribution of the towing load
D.All of the above

相关考题

At the instant when a string of casing being run from a...

单项选择题At the instant when a string of casing being run from a ship is landed in the well head,（）.

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

Anchor shackles should have a breaking strength that is...

单项选择题Anchor shackles should have a breaking strength that is（）.

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

An anchor winch should be equipped with mechanical brak...

单项选择题An anchor winch should be equipped with mechanical brakes capable of holding（）.

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

船舶索具名称

Back-up wires on a towed vessel provide（）.