单项选择题

A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n) （）.

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

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单项选择题
A position obtained by applying ONLY your vessel’s course and speed to a known position is a （）.

A.fix
B.dead-reckoning position
C.running fix
D.probable position
单项选择题
A polyconic projection is based on a （）.

A.plane tangent at one point
B.cylinder tangent at one parallel
C.cone tangent at one parallel
D.series of cones tangent at selected parallels
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