單項(xiàng)選擇題Electronic Chart Display and Information system can assist the mariner in().

A.voyage plan
B.stability calculate
C.calculate ETA
D.monitor strength


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1.單項(xiàng)選擇題When you doubt the existence of risk of collision,().

A.such risk shall be deemed to exist
B.Such risk shall not be deemed to exist
C.You should keep your course and speed
D.You needn‟t take any action to avoid collision with any vessel

5.單項(xiàng)選擇題The equatorial current flows to the()

A.east
B.northeast
C.southwest
D.west