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


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1.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

2.單項(xiàng)選擇題Steam smoke will occur when().

A.extremely cold air from shore passes over warmer water
B.warm dry air from shore passes over cooler water
C.cold ocean water evaporates into warm air
D.cool rain passes through a warm air mass

4.單項(xiàng)選擇題Periodic publications notifying changes in,or additions to,previously published navigational data are().

A.Supplements
B.Annual Summary
C.Navigational Warnings
D.Notices to Mariners

5.單項(xiàng)選擇題On the high seas,a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a().

A.vessel being towed
B.fishing vessel engaged in trawling
C.vessel at anchor warning you of her location
D.power-driven pilot vessel on station underway