以下哪一项是对类风湿性关节炎的正确描述() ["A．全身性疾病","B．原因明确","C．主要为大关节病变","D．多呈非对称性","E．病程短"]
流行性斑疹伤寒的传播媒介()黑热病的传播媒介()恙虫病的传播媒介()登革热的传播媒介()地方性斑疹伤寒的传播媒介() ["A．体虱","B．鼠蚤","C．恙螨","D．伊蚊","E．白蛉"]
脂肪肝的超声表现()①肝内脂肪含量>5%②肝轻、中度增大，边缘钝③肝回声增强、密集，后方回声衰减④肝血管纹理显示不清 ["A．①③","B．②③","C．②③④","D．②④","E．①②③④"]
正常肝静脉频谱特点() ["A．单相","B．双相","C．三相","D．双变","E．复杂"]
骨性关节炎的非药物适当治疗不包括() ["A．活动范围练习","B．应用热或冰","C．抗阻运动与有氧运动","D．减重","E．下蹲负重训练"]
请试述流行性斑疹伤寒与地方性斑疹伤寒的鉴别要点。
