单项选择题
A vessel aground at night is required to show two red lights in a vertical line as well as （）.
A.not under command lights B.restricted in her ability to maneuver lights C.anchor lights D.sidelights and a sternlight
单项选择题 A vessel（）when underway shall so far as possible，keep out of the way of a vessel not under command.
单项选择题 A vessel（）a crossing vessel，shall not normally enter a separation zone or cross a separation line.
单项选择题 A proper look-out shall be maintained（）.
