單項(xiàng)選擇題

You hear on the radiotelephone the word SECURITE spoken three times. This indicates that（）.

A.a message about the safety of navigation will follow
B.a message of an urgent nature about the safety of a ship will follow
C.the sender is in distress and requests immediate assistance
D.you should secure your radiotelephone

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You see an iceberg that has not been reported. What kind of radio message do you transmit to warn others?（）.

A.Safety message
B.Urgency message
C.Distress message
D.Routine message

單項(xiàng)選擇題

There is a drilling rig established（）position 24.1E 25.2N.

A.at
B.on
C.in
D.above