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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

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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

單項(xiàng)選擇題

Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.

A.flux
B.poles
C.magnets
D.azimuth