单选

分时操作系统的主要特征之一是提高 () 。

A.计算机系统的实时性
B.计算机系统的交互性
C.计算机系统的可靠性
D.计算机系统的安全性

试题出自试卷《2011年程序员考试考前密卷（五）-上午试题》

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