A single line of position combined with a dead-reckoning position results in a(n)（）.

A relative bearing is always measured from（）.

A.true north
B.magnetic north
C.the vessel's beam
D.the vessel's head

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A position that is obtained by using two or more intersecting lines of position，taken at nearly the same time，is a(n)（）.

A.estimated position
B.fix
C.running fix
D.dead-reckoning position

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