题目内容
选用耦合剂时不正确的方法是
2022-01-25
A.声衰减系数小,透声良好
B.价格越便宜越好
C.水性高分子材料
D.声阻抗介于探头的面材与皮肤之间
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='31794' and id < 2541759 and id<>'2541759' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31794' and id > 2541759 and id<>'2541759' order by id asc limit 5