單項選擇題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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A.Safety message
B.Urgency message
C.Distress message
D.Routine message
2.單項選擇題There is a drilling rig established（）position 24.1E 25.2N.
A.at
B.on
C.in
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