Annunciator an annunciator is an accessory device used to give remote indication of the status of an operating component in a system.

指示器指示器作为一个附属装置常用于远程显示系统的各个组成部分的运行状态。

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The automatic facing head is introduced in this peper, which is a machine accessory used in machining centers. W operating Principle and applying range are described. Two examples are Presented.

本文介绍了一种应用于加工中心上的机床附件—径向自动进给装置，阐述了其工作原理和作用．并给出了在加工中心上的应用实例。

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