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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

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單項(xiàng)選擇題

You will extinguish a fire when you remove（）.

A.nitrogen
B.oxygen
C.sodium
D.carbon dioxide

單項(xiàng)選擇題

You’d better（）your course to port to avoid collision.

A.to alter
B.alter
C.altering
D.altered

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