相关考题
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单项选择题
Keep to the middle of the（）(航道) ！
A.buoy
B.mark
C.beacon
D.channel -
单项选择题
An officer is always（）（值班）on the bridge .
A. on watch
B. taking watches
C. standing watches
D. keep watches -
单项选择题
What（）(航速)?
A.speed
B.line
C.wake
D.route
