单项选择题
The Rules state that vessels may depart from the Rules when（）.
A.there are other vessels in the vicinity B.operating in a traffic separation scheme C.engaged in a situation involving more than two vessels D.necessary to avoid immediate danger
单项选择题 Which statement about the Navigation Rules is TRUE?（）.
单项选择题 If a seaplane is not used as a means of transpiration on water but is capable of being used so，it shall（）.
单项选择题 If a vessel is engaged in fishing according to the definitions in the Rules，it will have （）.
