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
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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.
A.having engaged in fishing
B.engaging in fishing
C.engaged in fish
D.engaged in fishing -
单项选择题
A vessel（）a crossing vessel，shall not normally enter a separation zone or cross a separation line.
A.including
B.inclusive of
C.except that
D.other than -
单项选择题
A proper look-out shall be maintained（）.
A.only at night
B.only during restricted visibility
C.at night and during restricted visibility
D.at all times
