单项选择题
A.It allows the bottom soil to consolidate B.It gives the palms time to trip the anchor C.It stabilizes the mooring system D.It lubricates the anchor for better tripping
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
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