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【单选题】
以下关于at命令说法正确的是：A.
只能在本地计算机上执行，不能在远程计算机上执行
B.
安排在特定日期或时间执行某个特定的命令和程序
C.
只能在远程计算机上执行，不能在本地计算机上执行
D.
即可在Windows主机上执行，又可在Linux主机上执行
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