特发性血小板减少性紫癜最主要的发病机制是______________________________。
参考答案：机体产生抗血小板抗体
Which of the following statement about weighting schemes used in constructing stock market indexes is FALSE（）
A. The Nikkei Dow is a price-weighted index.
B. The Standards and Poor’s indexes are market value-weighted indexes.
C. A market-weighted index automatically adjusts for stock splits.
