單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.

A.cloud movement
B.vessel heading
C.waves
D.swells