b_block_device_有道手机词典

1.This paper gives a brief introduction to the design, block diagrams, operation principles and making of XTZ-B automatically monitoring device for ring-receiving system.
现对XTZ - B型收铃系统自动监视装置的设计思路、方框组成、工作原理、实现方法进行扼要介绍。
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