问题
单项选择题
A chart position enclosed by a square is a(n)（）.
A.fix
B.estimated position
C.dead reckoning position
D.running fix
答案
参考答案：B
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A chart position enclosed by a square is a(n)（）.
A.fix
B.estimated position
C.dead reckoning position
D.running fix
参考答案：B