介绍了系统结构、工作原理，阐述了数字语音交换、混合等关键技术和基本原理。
The system structure and work theory are introduced. The key technology and basic theory of the digital audio exchange and mixing are expatiated.
本文报导用核磁共振(nmr)技术研究醇-水混合体系中发生缔合作用的质子间的交换作用过程。
Exchange process between associating protons in the ethanol-water mixture system was described by NMR.
离子交换法处理电镀混合废水是一种较为实用的回用技术。
Ion exchange is one of practical measures to treat electro-plating wastewater for reuse.
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