下列疾病紫癜的原因为血小板异常的是()
A.过敏性紫癜
B.药物性紫癜
C.机械性紫癜
D.血小板无力症
E.血友病
参考答案:D
把数据同时存放在两个或者多个硬盘驱动器上,每个驱动器存放一份拷贝的技术称为______ 。
Which of the following is true according to the speaker().
A.We have extra time to complete the assignment.
B.We won’t see the professor until next week.
C.The professor asks us to turn in the papers within a week