0157:H7大肠埃希菌区别于其他肠杆菌的特征性反应是不发酵() ["葡萄糖","麦芽糖","甘露醇","山梨醇","乳糖"]
病人发生甲状腺功能亢进时,其摄取率I,2小时至少超过() ["15%","20%","25%","30%","35%"]
微绒毛最发达的部位位于()。 ["远直小管","近曲小管","近直小管","远曲小管","弓形集合小管"]
安全摄入范围位于()。 ["EAR和UL之间","EAR和AI之间","RNI和UL之间","RNI和AI之间","UL和AI之间"]
统计学中,变异系数越大,表示() ["A、相对变异程度越大","B、平均数越大","C、标准差越大","D、样本含量越大","E、标准差越小"]
什么叫功能性低聚糖?有什么生理功能?