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

单项选择题

You are in charge of a stand-on vessel in a crossing situation.The other vessel is 1.5 miles to port.You believe that risk of collision exists.You should（）.

A.take avoiding action immediately upon determining that risk of collision exists
B.immediately sound the danger signal
C.take avoiding action only after providing the give-way vessel time to take action ,and determining that her action is not appropriate
D.hold course and speed until the point of extremis, and then sound the danger signal, taking whatever action will best avert collision