单项选择题
Keep the vessel to the （）(中间)of the channel.
A.port
B.middle
C.head
D.front
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The after part of a ship is called（）(船尾) .
A.head
B.tail
C.stern
D.quarter -
单项选择题
Steer（）（北）！
A.south
B.north
C.east
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单项选择题
Keep the NO1（）(浮标) on the port side!
A.buoy
B.mark
C.beacon
D.channel
