单项选择题
A.coming into effect B.moving to full effect C.being based on force D.coming into force
Radar bandwidth is normally（）to the range scale and the...
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
A rectangular area is described in degrees of latitude ...
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（）.
A.square B.triangle C.circle D.rectangle
Vessel in distress（）indicate their position by any meth...
单项选择题Vessel in distress（）indicate their position by any method.
A.cannot B.are not allowed C.have the right D.should get permission to
