如果脉冲重复频率是12kHz,可导致混迭的多普勒频移是（     ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='25739' and id < 2163406 and id<>'2163406' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25739' and id > 2163406 and id<>'2163406' order by id asc limit 5