单项选择题

Chafing gear is normally used（）.

A.for portable fenders
B.for ground tackle
C.on the inside of the hawsepipe
D.on mooring lines

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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

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
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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