单项选择题

What describes an accurate position that is NOT based on any prior position? （）

A.Dead-reckoning position
B.Estimated position
C.Fix
D.Running fix

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This is（）where we shall anchor.A.the light-houseB.the a...

单项选择题This is（）where we shall anchor.

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地文航海

What describes an accurate position that is NOT based on any prior position? （）