单项选择题 MV SUDAN/MEAN AT 0200UTC IN POSITION 40.44N 141.52E PASSED A DERELICT ABOUT 40 TONS HALF SUBMERGED AND IS DRIFTING. This cable says that she met with possibly（）.

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

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