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【单选题】
分时操作系统的主要特点是（）。A.
个人独占计算机资源
B.
自动控制作业运行
C.
高可靠性和安全性
D.
多个用户同时使用一台计算机资源
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反馈参考答案：
举一反三
【单选题】What was the serious problem after the cane toads arrival in Australia?
A.
The cane toads did not eat the cane beetles.
B.
The number of the cane toads had swollen.
C.
There was another outbreak of the cane beetles.
D.
The cane toads killed all the cane beetles.
【简答题】世界文学史上第一个血肉丰满的无产阶级英雄形象是高尔基的作品中的主人公______。
【单选题】So far the majority of cloned animals have suffered from some different serious disorders, ______ died soon after birth.
A.
many of which
B.
many of whom
C.
many of them
D.
many of that
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