与急性特发性血小板减少性紫癜发病最相关的原因是（）
A.病毒感染
B.酗酒
C.阿司匹林
D.安痛定
E.SLE
参考答案：A
桥梁预施应力使用压力表应为防振型，最大读数应为张拉力对应压力值的（）倍。精度不应低于1.0级。首次使用前必须经（）检定。使用时必须定期检定。检定有效期为一周。当使用（）级时，检定有效期可为一个月。
As the years passed, many occasions-birthdays, awards, graduations__________ with Dad's flowers. [ ]
A. are marked
B. were marked
C. have marked
D. had marked
