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

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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

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

单项选择题

After deploying the anchor，a permanent chain chaser is（）.

A.removed from the anchor chain
B.connected to a buoy at the anchor
C.stripped back to the rig and secured
D.connected to a buoy halfway down the chain