在请求调页系统中,凡未装入过内存的页都应该从()调入;已运行过的页主要是从()调入,有时也从()调入。
A. 系统区
B. 文件区
C. 对换区
D. 页面缓冲池
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The siren also reaches its top and then suddenly goes off.What's the meaning of the underlined part?
A. stop, discontinue
B. leave
There is absolute dead _________ for a long moment.
A. silent
B. silence
The previously __________ objects have now been identified as being satellites.
A. unidentified
B. unidentifying
There are no enemy missiles ___________.
A. approach
B. approaching