单项选择题

The fog most commonly encountered at sea is called（）.

A.conduction fog
B.radiation fog
C.frontal fog
D.advection fog

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单项选择题

The Daily Memorandum contains information on（）.

A.active weather disturbances such as hurricanes or tropical storms
B.the latest navigational warnings
C.scheduled vessel arrivals and departures for a 24-hour period
D.water levels at river ports where run-off affects tidal heights

单项选择题

The charts show two dashed lines crossing the river justsouth of St. Catherine Bar Light. What does this indicate? （）

A.Overhead power lines
B.Louisiana-Mississippi ferry crossings
C.Two railroad trestles
D.Two submerged oil pipelines

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The broken magenta line which runs parallel to the shorebetween Roanoke Point and Mattituck Inlet marks a（）.

A.fish trap area
B.pipeline
C.demarcation line
D.cable area