单项选择题

PAN-PAN repeated three times over the radiotelephone indicates which type of message will follow?（）

A.Distress
B.Safety
C.All clear
D.Urgency

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单项选择题

In radiotelephone communications，the prefix PAN-PAN indicates that（）.

A.a ship is threatened by grave and imminent danger and requests immediate assistance
B.a calling station has an urgent message about the safety of a person
C.the message following the prefix will be about the safety of navigation
D.the message following is a meteorological warning

单项选择题

Fog forms when the air（）.

A.is 50% water saturated
B.is 90% water saturated
C.temperature is greater than the dew point temperature
D.temperature is equal to，or below the dew point temperature

单项选择题

Five or more short blasts on a vessel’s whistle indicates that she is（）.

A.in doubt that another vessel is taking sufficient action to avoid a collision
B.altering course to starboard
C.altering course to port
D.the stand-on vessel and will maintain course and speed