单项选择题
The 3-cm radar as compared to a 10-cm radar with similar specifications will（）.
A.give better range performance in rain，hail，etc B.display small targets in a mass of dense sea clutter at a greater range C.have less sea return in choppy rough seas D.display a more maplike presentation for inshore navigation
单项选择题 The “urgent” priority should be used for messages（）.
单项选择题 The “horse latitudes” are regions of（）.
单项选择题 One of the first actions to be taken by survivors when they have boarded an inflatable liferaft is to（）.
