问题
单项选择题
You should plot your dead reckoning position at（）.
A.every fix or running fix
B.every course change
C.every speed change
D.All of the above are correct
答案
参考答案：D
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You should plot your dead reckoning position at（）.
A.every fix or running fix
B.every course change
C.every speed change
D.All of the above are correct
参考答案：D