在有爆炸、火灾等危险场所、防火防爆的重要措施有:通风、密封和()。 ["屏护","监视","接地","闭锁"]
传媒管理的概念和分类?
以HCl溶液滴定某碱样,滴定管的初读数为0.25±0.01ml,终度数为32.25±0.01ml,则用去盐酸溶液的准确容积为:() ["32ml","32.0ml","32.00ml","32.00±0.01ml","32.00±0.02ml"]
定量分析要求测定结果的误差:() ["愈小愈好","等于零","没有要求","略大于允许误差","在允许误差范围内"]
放线菌
共生作用