单项选择题
A.enable SAR operations to start with minimum delay B.give facilities to marine communication C.reduce sharply the chances of ship’s sinking D.both A and C
By using previous communication system, rescue is often...
单项选择题By using previous communication system, rescue is often a matter of chance. What does “a matter of chance” mean?（）
A.occasionally B.accidentally C.often D.usually
We（）a sharp lookout while sailing in the iced waters.A....
单项选择题We（）a sharp lookout while sailing in the iced waters.
A.keep B.kept C.are keeping D.have kept
When a mis-entry（）in the logbook, a red line would be d...
单项选择题When a mis-entry（）in the logbook, a red line would be drawn through that part.
A.has made B.make C.has been made D.is making
