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

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

A.spring
B.later winter
C.autumn
D.end of summer
单项选择题
Maintenance of charts and nautical publications up to date is a statutory requirement under the（）Convention.

A.STCW
B.MARPOL
C.SOLAS
D.ISM
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