进行低频电诊断时，用足够长的脉冲刺激, 引起肌肉最小收缩的电流阈值称为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25686' and id < 2158744 and id<>'2158744' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25686' and id > 2158744 and id<>'2158744' order by id asc limit 5