你可能感興趣的試題

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

單項(xiàng)選擇題

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

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

你可能感興趣的試題

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

Fog forms when the air（）.

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