单选题：磁盘是可共享设备，因此每一时刻（　　）作业启动它。

题目内容：

磁盘是可共享设备，因此每一时刻（　　）作业启动它。 A．可以有任意多个
B．能限定几个
C．至少能有1个
D．至多能有1个

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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