单项选择题

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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单项选择题
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
单项选择题
Radiation fog is more commonly encountered in（）.

A.spring
B.later winter
C.autumn
D.end of summer
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