下列哪种成分不属于外毒素() ["脂多糖","痉挛毒素","肉毒毒素","表皮剥脱毒素","霍乱肠毒素"]
密度ρ=1.2kg/m3的空气,经直径d=1000mm的风管流入下游二支管中如图所示,支管1的直径d1=500mm,支管2的直径d2=300mm,支管的断面流速分别为v1=6m/s,v2=4m/s,则上游干管的质量流量为() ["1.95kg/s","1.75kg/s","1.65kg/s","1.45kg/s"]
治疗郁证痰气郁结证的代表方剂是() ["二陈汤","逍遥散","涤痰汤","半夏厚朴汤","血府逐瘀汤"]
郁证的治疗原则是() ["理气开郁,调畅气机","疏肝理气","疏通气机,理气活血","调理肝脾","活血化瘀"]
以下国内机构中无法提供理财服务的是()。 ["基金公司","保险公司","信托公司","律师事务所"]
在训练犬建立条件反射时应注意什么?