单项选择题
A.Limited backing power of his vessel
B.Radar information about nearby vessels
C.The occupation of the other vessel，if known
D.All of the above
单项选择题 In dense fog a vessel without operational radar may not be justified（）at all but should anchor if it is safe and practicable for her to do so.
单项选择题 In determining a safe speed（）shall not be among those taken into account.
单项选择题 In determining a safe speed（）shall not be among those taken into account.