热电气质trace GC-dsq2，开机1月左右，最近SIM模式扫描4种目标物，同一个样品瓶进几针，出现倒峰，关键是每一针倒峰还不同，想问坛友们：气质单杆SIM扫描，出现倒峰是咋回事？[img=,690,427]https://ng1.17img.cn/bbsfiles/images/2018/09/201809121608011603_1740_2630288_3.png[/img][img=,690,409]https://ng1.17img.cn/bbsfiles/images/2018/09/201809121608017003_2706_2630288_3.png[/img][img=,690,392]https://ng1.17img.cn/bbsfiles/images/2018/09/201809121608020783_7851_2630288_3.png[/img]