[名词解释] 晨僵

风湿性疾病 雷诺现像 类风湿结节 哪种动物为我国北方各省钩端螺旋体病的主要传染源() ["A．鼠","B．犬","C．蜱","D．猪","E．牛和羊"] 以下哪项是钩端螺旋体病的易感人群() ["A．牧民","B．兽医","C．渔民","D．农民","E．伐木工人"] 晨僵