搭肩试验阳性是指() ["手搭到对侧肩部,肘部可紧贴胸部","手搭到对侧肩部,肘部不可紧贴胸部","手搭到同侧肩部,肘都可紧贴胸部","手搭到同侧肩部,肘部不可紧贴胸部","以上都不对"]
下列除哪项外,均是生物多样性的内容() ["遗传多样性","变异多样性","物种的多样性","生态系统多样性"]
关于重复电刺激检查阳性的说法正确的是() ["是重症肌无力的特征性表现","可见于周期性麻痹","是脊髓前角病变的重要指标","是脱髓鞘病变的重要指标","也是神经根病变的重要指标"]
最常见的关节脱位是() ["A.肩关节","B.肘关节","C.髋关节","D.膝关节","E.踝关节"]
关于肺通气/血流比值() ["0.8是各部位的综合值","上部比值大于1","上部比值等于1","中部比值等于1","下部比值恰为0.8"]
试举出三种我国半干旱区防沙治沙适生植物()、()和()。