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航海英語(yǔ)航海圖書(shū)資料單項(xiàng)選擇題每日一練(2018.11.04)

單項(xiàng)選擇題
A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started? （）
A.When the towing vessel enters the fog
B.When the drilling rig enters the fog
C.When the towing vessel can no longer be seen from the rig
D.Immediately
單項(xiàng)選擇題
Particular care is needed when navigating in the vicinity of（）as very few of these features have been fully surveyed to modern standards to determine their correct position，full extent，or the least depth over them.
A.SW of Cocos Islands
B.oceanic dangers or seamounts
C.undiscovered dangers
D.the continental shelf
單項(xiàng)選擇題
Charted depths are decreased（）2 meters．
A.in
B.on
C.with
D.by
單項(xiàng)選擇題
A line of position derived from a loran reading is a section of a(n) （）.
A.straight line
B.arc
C.parabola
D.hyperbola
單項(xiàng)選擇題
From （） the mariner can know the data of tide．
A.the Sea Pilot
B.the Cargo Plan
C.the Tide Table
D.the Port List

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