單項(xiàng)選擇題

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

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單項(xiàng)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

單項(xiàng)選擇題

By convention，the north seeking ends of a compass’ magnets are colored（）.

A.Black
B.Blue
C.Red
D.White

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

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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.

By convention，the north seeking ends of a compass’ magnets are colored（）.

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.

By convention，the north seeking ends of a compass’ magnets are colored（）.