题目内容
动态聚焦的特点是（ ）
2021-10-14
A.声透镜聚焦
B.对发射声波进行电子聚焦
C.多点聚焦
D.声波增益补偿
E.对回声跟踪聚焦
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='25734' and id < 2163146 and id<>'2163146' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25734' and id > 2163146 and id<>'2163146' order by id asc limit 5