以下哪项是肝豆状核变性的临床特征
A.CT特征性改变
B.肝肿大、惊厥
C.肝细胞损害、脑退行性病变和角膜K-F环
D.肝肿大、贫血和锥体外系症状
E.肝硬化及锥体外系症状
参考答案:C
对物质进行分类,是研究物质的基本方法。在下面的四种化合物中,与另外三种不属于同一种类别的物质是 [ ]
A.KNO3
B.NaCl
C.CO2
D.KMnO4
The boy is too young to go to school. [ ]
A. too old to go to school
B. old enough to go to school
C. such young that he can't go to school
D. so young that he can't go to school