A.avoid crossing the channel if it impedes another vessel navigating in the channel
B.not overtake any vessels within the channel
C.keep as close as possible to the edge of the channel on her port side
D.anchor only in the middle of the channel

A.not under command lights
B.restricted in her ability to maneuver lights
C.anchor lights
D.sidelights and a sternlight

A.having engaged in fishing
B.engaging in fishing
C.engaged in fish
D.engaged in fishing

A.including
B.inclusive of
C.except that
D.other than

A.only at night
B.only during restricted visibility
C.at night and during restricted visibility
D.at all times

A.only in fog
B.only between the hours of sunset and sunrise
C.only when entering and leaving port
D.at all times

A.one sidelight of a vessel ahead of you
B.one sidelight and a masthead light of a vessel ahead of you
C.one sidelight，a masthead light，and a range light of a vessel ahead of you
D.both sidelights of a vessel dead ahead of you

A.humidity
B.varying densities of water
C.vessel traffic
D.the jet stream

A.besides
B.excepted
C.otherwise
D.other than

A.there are other vessels in the vicinity
B.operating in a traffic separation scheme
C.engaged in a situation involving more than two vessels
D.necessary to avoid immediate danger