单项选择题
All of the following are recognized distress signals under the Navigation Rules EXCEPT（）.
A.a green star signal B.orange-colored smoke C.red flares D.the repeated raising and lowering of outstretched arms
单项选择题 All of the following are distress signals under the Rules EXCEPT（）.
单项选择题 According to the “Vessel Bridge-to-Bridge Radiotelephone Act”，your radiotelephone log must contain（）.
单项选择题 A vessel，which does not normally engage in towing operations，is towing a vessel in distress. She（）.
