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
单项选择题 The broken magenta line which runs parallel to the shorebetween Roanoke Point and Mattituck Inlet marks a（）.
单项选择题 The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.
单项选择题 Steam smoke will occur when（）.
