单项选择题
The centre of lateral resistance is（）.
A.the center of the hydrodynamic forces acting on the underwater hull to resist the effect of the wind
B.the point of influence of wind on the ship
C.the pivot point
D.the point on the ship's above-water structure upon which the whole force of the wind can be considered an act
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相关考题
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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 -
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
