单选题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 necessaryB SemiannuallyC AnnuallyD Every five years

Which statement about entering into a tank which has been sealed for a long time is TRUE ________．

A.The tank should be tested only once to ensure the oxygen content is at least 14% before entry

B.The tank must be tested at frequent intervals to ensure that hazardous gasses have not regenerated

C.The tank need not be tested for oxygen content if it is ventilated for more than 24 hours

D.If the oxygen content tests at less than 12% you should wear an approved gas mask

Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south ________．

A.Quadrantal spheres

B.Heeling magnets

C.Flinders bar

D.Fore-and-aft magnets

A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?

A.Move the quadrantal spheres closer to the compass

B.Raise the heeling magnet if the red end is up

C.Remove some of the Flinders bar

D.Raise or lower the athwartship magnets

Deviation which is maximum on intercardinal compass headings may be removed by the ______．

A.Flinders bar

B.Transverse magnets

C.Fore-and-aft magnets

D.Soft iron spheres on the sides of the compass

Which compensates for errors introduced when the vessel heels over ________．

A.The soft iron spheres on the arms of the binnacle

B.Magnets placed in trays inside the binnacle

C.A single vertical magnet beneath the compass

D.The Flinders bar

When crossing the magnetic equator the ______．

A.Flinders bar should be inverted

B.Heeling magnet should be inverted

C.The quadrantal spheres should be rotated 180°

D.Flinders bar should be moved to the opposite side of the binnacle

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

Which statement concerning the lashings of containers with solid bar or wire rope lashings is TRUE ________．

A.Stack weights should be less when using a solid bar lashing as compared to a wire lashing

B.Stack heights may be increased when using a solid bar lashing

C.Stack heights should be reduced when using a solid bar lashing

D.Solid bars should be used for lashing the first tier only，with wire lashings on the higher tier（s）

Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism．These correctors are the ______．

A.Fore-and-aft and athwartships magnets

B.Dip needle and heeling magnet

C.Heeling magnet and Flinders bar

D.Flinders bar and quadrantal spheres

You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made ________．

A.Flinders bar first，then the heeling magnet and spheres

B.Heeling magnet first，then the Flinders bar and spheres

C.Flinders bar first，then the spheres and heeling magnet

D.Spheres first，then the Flinders bar and heeling magnet