题目: —Mary can't help ____ the house. Why? —Because she is busy ____ a hotel reservation. [ ]A. to clean; making B. cleaning; making C. cleaning; to make D. to clean; to make 答案: 答案:A
题型:单项选择题 假设读写磁头正在55号柱面上操作,有依次请求访问的柱面号次序为100、185、35、124和67。当55号柱面上操作完成后,若采用最短寻找时间优先调度算法,为完成这些请求,磁头需要移动过的柱面数是( )A.170B.194C.260D.280 查看答案