單項選擇題

That（）is not caused by shallow water.

A.turning ability deteriorates
B.virtual mass increases
C.the effect of the propeller transverse thrust on yaw alters
D.the ship will turn with its head towards the wind

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單項選擇題

Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.

A.obscured
B.darkened
C.greyed
D.delighted

單項選擇題

Pilotage in this country is（）.

A.Free of charge
B.Important
C.Required
D.Unnecessary

That（）is not caused by shallow water.

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Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.

Pilotage in this country is（）.

Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.