单选题What is the primary disadvantage of a permanent chain chaser system?（）A It requires anchor handling boats with more horsepowerB Chain chasers work in shallow water onlyC Chain chasers will not work with piggyback anchorsD It takes longer to deploy anch

What are the two main types of stud link chain ________．

A.Oil Rig chain and Oil Field Stud Link chain

B.Flash-butt welded chain and Di-Lok chain

C.Flash-butt welded chain and Oil Rig chain

D.Oil Field Stud Link chain and Flash-butt welded chain

What may NOT be used when securing heavy vehicles aboard Ro-Ro vessels ________．

A.Chain lever

B.Turnbuckle

C.Webbing

D.Chain

________ is the chain?

A.How

B.What

C.How about

D.What about

The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval ________．

A.They are not subject to permanent magnetism; no check is necessary

B.Semiannually

C.Annually

D.Every five years

The disadvantage（s）of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that ______．

A.It is heavy

B.The links lose strength if placed over corners

C.It does not absorb shock

D.All of the above

What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude ________．

A.Flinders bar

B.Soft iron spheres

C.Fore-and-aft permanent magnets in their trays

D.Heeling magnet

A disadvantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it is ______.

A.heavy

B.easily damaged

C.affected by temperature

D.costly relative to the strength ratio