单项选择题
“Port a little sluggish” means（）
A. that the port rudder answers very well. B. that the port rudder answers slow. C. that the port rudder answers quickly. D. that the port rudder is broken.
单项选择题 Bow （）(推进器) full to starboard.
单项选择题 Keep to the middle of the（）(航道) ！
单项选择题 An officer is always（）（值班）on the bridge .
