血小板无力症表现为下列哪种成分的缺陷（）
A.GPⅡb/Ⅲa
B.PF4
C.PF3
D.GPⅠb聚集成复合物
E.P-选择素
参考答案：A
(2014·陕西宝鸡质量检测二)Evidence came up________special speech sounds can be recognized by babies as young as 6 months old.
A．what
B．which
C．that
D．whose
比较负载测试，容量测试和强度测试的区别
