branch exchange短语¹⁴⁴⁹⁷²⁺² 基本例句 交换分机 Main products to require: branch exchange, concentrator, lines etc. 所需的主要网络产品:交换机,集线器,超五类线等。 zahuiwang Using computer and special voice- processing card, a small-scale VMSS which is designed for private Branch Exchange PBX is developed. 利用计算机和专用电话语音处理卡,开发了一种适合于用户交换机的小型语音信箱系统。 cnki