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單項(xiàng)選擇題

The notice which is based on original information is indicatedby（）nexttothenotice number.

A.a star
B.a dot
C.a dash
D.a circle

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單項(xiàng)選擇題

What areessentialto ensure the effective implementationoftheship securityplan?（）

A.Controlling access to the ship
B.Training and drills
C.Controlling the restrictedareas
D.Monitoring the ship at times

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Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading?（）

A.Salinity of water
B.Temperature of water
C.Atmospheric pressure
D.Type of bottom

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