问题2:为引起该肌收缩，用指数曲线波刺激,其脉冲前沿的宽度至少应是（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='25668' and id < 2157323 and id<>'2157323' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25668' and id > 2157323 and id<>'2157323' order by id asc limit 5