单项选择题
Radar bandwidth is normally（）to the range scale and the associated pulse length.
A.fixed B.matched C.fitted D.equal
单项选择题 A rectangular area is described in degrees of latitude and longitude from the latitude and longitude of the southwest corner of（）.
单项选择题 Vessel in distress（）indicate their position by any method.
单项选择题 The list of Coast Stations is republished（）in a trilingual.
