A.that had been driven
B.had been driven
C.have been driven
D.which to have been driven

A.pelican hook
B.hydraulic deck stopper
C.connecting link
D.shackle

A.clean off any mud that may have accumulated on the chain
B.engage or disengage the wildcat
C.fairlead the chain from the hawse pipe to the wildcat
D.prevent the chain from fouling the wildcat

A.situated／connected
B.situated／connecting
C.situating／connected
D.situating／connecting

A.ability of the anchors to hold in a seabed
B.anchor chain catenary length
C.variability of the fairlead
D.angle of the flukes

A.A downbound vessel
B.An upbound vessel
C.Current reaction when the lock chamber is being emptied
D.Current reaction when the lock chamber is being filled

A.pigtail chain
B.thrash chain
C.crown chain
D.wear chain

A.amount of chain lying along the bottom increases
B.length of the catenary is reduced
C.mooring line tension is increased
D.amount of chain lying along the bottom decreases

A.design of the anchor
B.weight of the anchor
C.scope of the anchor chain
D.size of the vessel

A.the amount of line paid out
B.how much the vessel sheers while at anchor
C.any change in the tautness of the anchor chain
D.changes in bearings of fixed objects onshore

A.eliminate navigational hazards by allowing the chain to lie along the harbor bottom
B.increase the anchor's reliability by providing a large catenary in the chain
C.permit the ship to maneuver in the stream while weighing anchors
D.prevent damage to the stern caused by swinging against the pier in the approach