单项选择题
A. Port a little. B. Port more. C. Port five. D. Starboard ten.
A. Port ten. B. Port slow. C. Port five. D. Starboard ten.
A. What is your rudder? B. What is your course? C. What course? D. How course?
---Steady! ---Steady!（）.
A. Wheel steady B. Course 120° C. Port D. Ready
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