單項選擇題

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

你可能感興趣的試題

The Flinders bar on a magnetic compass compensates for the（）.

A.Induced magnetism in vertical soft iron
B.Induced magnetism in horizontal soft iron
C.Permanent magnetism in ship's steel
D.Vessel's inclination from the vertical

單項選擇題

In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.

A.GPS
B.GMDSS
C.AIS
D.Navtex

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

你可能感興趣的試題

The Flinders bar on a magnetic compass compensates for the（）.

In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.

In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.