钢和铁的主要成分是铁和( )。
A.氧
B.硫
C.碳
D.硅
参考答案:C
给下列对话标上顺序。
( ) Here you are!
( ) Where is my pencil case?
( ) Excuse me, John. Can I use your pencil case?
( ) OK.
( ) Thank you.
( ) Look, it's here, under your backpack.
若肾活检结果显示:肾小球内皮及系膜增生,系膜区有中性粒细胞及单核细胞浸润,最可能的诊断是
A.膜性肾病B.局灶节段性肾小球硬化症C.毛细血管内增生性肾炎D.未分类的肾小球肾炎E.微小病变肾病