单项选择题

Fog is most commonly associated with a(n)（）.

A.warm front at night
B.low pressure area
C.anticyclone
D.lack of frontal activity

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单项选择题

Charted depths are decreased（）2 meters．

A.in
B.on
C.with
D.by

单项选择题

Charted depths（）by 2 meters due to state of the winds．

A.is decreased
B.decreased
C.decreases
D.are decreased

单项选择题

Charted depth is the（）.

A.vertical distance from the tidal datum to the ocean bottom plus the height of the tide
B.vertical distance from the tidal datum to the ocean bottom
C.average height of water over a specified period of time
D.average height of all low waters at a place