单项选择题
“safe speed” is defined as that speed where（）.
A.you can stop within your visibility range B.you can take proper and effective action to avoid collision C.you are traveling slower than surrounding vessels D.no wake comes from your vessel
单项选择题 Deep-sea liners are（）.
单项选择题 The document which shows a vessel’s nationality，ownership，and tonnage is the（）.
单项选择题 The Tonnage Certificate gives the（）of a ship which is classified into gross tonnage and net tonnage.
