单项选择题
A.A long swell from an unusual direction
B.A lengthy lull in the wind and seas
C.Large seas coming from different directions
D.A brisk chop from the southeast
单项选择题 When the period of beam seas equals the natural rolling period of a vessel，what will most likely occur?（）
单项选择题 When taking soundings on a floating ship，the tape should be lowered and brought back quickly to（）.
单项选择题 When running before a heavy sea，moving weights aft will affect the handling of a vessel by （）.