單項(xiàng)選擇題You should plot your dead reckoning position（）.
A.when you obtain an estimated position
B.only in piloting waters
C.at every speed change
D.All of the above are correct
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1.單項(xiàng)選擇題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
2.單項(xiàng)選擇題You will extinguish a fire when you remove（）.
A.nitrogen
B.oxygen
C.sodium
D.carbon dioxide
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