单项选择题
The term restricted visibility，when used in the Rules，refers to（）.
A.situations when you can see vessels on radar that you cannot see visually B.visibility of less than half a mile C.any condition where visibility is restricted D.visibility where you cannot see shore
单项选择题 The term power-driven vessel means（）in these Rules.
单项选择题 The steering and sailing rules for vessels in restricted visibility apply to vessels（）.
单项选择题 The Rules state that certain factors are to be taken into account when determining safe speed. Those factors include（）.
