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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Areas enclosed by a long and short dashed magenta line indicate （）.

A.cable areas
B.dumping grounds
C.fish trap areas
D.precautionary areas

单项选择题

An occulting light is one in which （）.

A.the period of darkness exceeds the period of light
B.there is only a partial eclipse of the light
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AFTER DROPPING THE PILOT means （）.

A.After boarding the pilot
B.After the pilot leaving the ship
C.After the pilot going on board
D.After taking the pilot