单项选择题

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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单项选择题

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

单项选择题

Pilotage in this country is（）.

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