單項選擇題A current perpendicular to a vessel’s track has the greatest effect on the vessel’s course made good().
A.at high vessel speeds
B.at low vessel speeds
C.in shallow water
D.in deep water
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1.單項選擇題When compared to air temperature,which factor is most useful in predicting fog?()
A.Vapor pressure
B.Dew point
C.Barometric pressure
D.Absolute humidity
2.單項選擇題Radiation fog is more commonly encountered in().
A.spring
B.later winter
C.autumn
D.end of summer
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