已知a、b互为相反数,c、d互为倒数,则代数式5(a+b)-2cd的值为 [ ]
A、3
B、-2
C、-3
D、0
答案:B
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