引起机体发生反应的环境变化是() ["反射","兴奋","刺激","反应","抑制"]
鼠疫耶尔森菌的理化特征包括() ["鼠疫耶尔森菌为两端钝圆,两极浓染的椭圆形小杆菌","革兰染色阴性","无鞭毛,有芽胞,能活动","对外界抵抗力较弱,对干燥、热和一般消毒剂均甚敏感","在蚤粪中存活1个月,在尸体中可活数周至数月"]
经常通过土壤-人途径而致病的是() ["伤寒、痢疾等肠道传染病","破伤风和肉毒中毒","流感","钩端螺旋体病","乙型脑炎"]
细胞产生动作电位的最大频率取决于() ["刺激频率","兴奋性","锋电位强度","不应期长短","刺激强度"]
经常通过动物-土壤-人途径传染给人的疾病是() ["伤寒、痢疾等肠道传染病","破伤风和肉毒中毒","流感","钩端螺旋体病","乙型脑炎"]
肠外营养根据输入途径可分为经()肠外营养和经()肠外营养。