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单选题

If either of these devices is installed explain whether it is required equipment

A如果安装了某一个设备,那么要说明安装它的重要性。

B如果安装了其中一个设备,则说明它是否是必需的设备。

C如果安装了两个设备,需要说明其必要性。

正确答案:A (备注:此答案有误)

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