单项选择题

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

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

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单项选择题

A.the period of darkness exceeds the period of light
B.there is only a partial eclipse of the light
C.the periods of light and darkness are equal
D.the period of light exceeds the period of darkness

单项选择题

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