His parents thought he was working very hard in the room, _____in fact, he was chatting with his friends on the Internet.

A．when

B．where

C．which

D．while

血小板聚集试验中ADP、胶原和花生四烯酸诱导的血小板聚集正常，但瑞斯托霉素诱导的血小板不凝集，符合哪种疾病（）。

A.血小板花生四烯酸代谢缺陷

B.贮存池病：α颗粒缺陷

C.血小板无力症

D.贮存池病：致密颗粒缺陷

E.巨大血小板综合征