单项选择题
（）gives a description of the combined Cardinal and Lateral Buoyage system including textual and diagrammatic explanations of the five types of marks;lateral;cardinal,isolated danger;safe water and special marks.
A.Ocean Passages for the World B.Symbols and Abbreviations used on Admiralty Charts，Chart 5011 C.IALA Maritime Buoyage System D.The Mariners Handbook
单项选择题 A rigid replica of the International Code flag “A” may be shown by a vessel （）.
单项选择题 A report of casualty to a mobile offshore drilling unit must include （）.
单项选择题 A report of casualty to a mobile offshore drilling unit must be made in writing to which office? （）
