单项选择题
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
A.by
B.with
C.on
D.in
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A.cable areas
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An occulting light is one in which （）.
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单项选择题
AFTER DROPPING THE PILOT means （）.
A.After boarding the pilot
B.After the pilot leaving the ship
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D.After taking the pilot
