单项选择题
The rule regarding look-outs applies（）.
A.in restricted visibility B.between dusk and dawn C.in heavy traffic D.All of the above
单项选择题 The VTS has been designed to aid in（）.
单项选择题 Traffic separation schemes may be（）by the Organization for the purpose of these Rules.
单项选择题 Vessel shall normally join or leave a traffic lane（）of the lane.
