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【简答题】某系统磁盘块大小为512B,文件A共有10个逻辑记录(r0—r9),逻辑记录大小与磁盘块大小相同。 (1)画出文件A的索引文件结构(磁盘块号自行确定)。 (2)当要读文件A的记录r5时,问需要进行多少次I/O操作?要求做必要的说明。
【简答题】One day, a man found the cocoon (茧) of a butterfly and he brought it home. A few days later, the man saw a small hole in the cocoon. He sat and watched for several hours as a butterfly struggled to fo...
【简答题】The Touchstone When the great library of Alexandria burned, the story goes, one book was saved. But it was not a valuable book; and so a poor man, who could read a little, bought it for very little mo...
【单选题】Water is much more precious than electricity, for the water for drinking is__________.
A.
disappointed
B.
limited
C.
terrible
D.
various
【简答题】完形填空。 Years ago, a farmer owned some land along the Atlantic coast. He often advertised for assistants, but he got no reply as most people feared the terrible storms across the Atlantic coast. Finally...
【单选题】Dirty water must not be ______ with drinking water.
A.
joined
B.
linked
C.
mixed
D.
combined
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