The key of layering productivity evaluation a multiplayer producing well is to measure its performance parameters, which is a mature technique of production logging.
多层合采井产能评价的关键是测量分层动态参数，而对于生产测井来说这已是较为成熟的技术。
A reference sinusoidal circuit based on digital technique and synchronous with the line voltage is investigated. The design principle of the key circuit parameters is given.
本文研究了一种采用数字化技术，实现与电网电压同步的基准正弦电路的原理，给出了电路关键参数的设计原则。
Discuss the interference subtraction process and signal suppression technique. The estimation of several key parameters is analyzed.
重点讨论了干扰对消过程和信号抑制技术，对几个关键参数的估计进行了分析。
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