It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.
3.监理单位未按要求派驻监理人员，监理人员数量不足，且人员不符合要求。总监工程师长期不在岗履职，未见打卡及会议签到记录；专业监理工程师一人在岗，但无社保；现场问题较多，监理形同虚设。，推荐阅读服务器推荐获取更多信息
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