单项选择题
The fitting of an efficient radar reflector is likely to considerably increase the ship’s probability of（）.
A.detection B.being detected C.the detective D.the detected
单项选择题 The description Racon beside an illustration on a chart would mean a（）.
单项选择题 The correct method of switching off a marine radar is to turn power switch to（）position first，then to（）position.
单项选择题 The common way to obtain your ship’s position is（）.
