Objective: 4-hydroxycoumarin is a pivotal intermediate in synthesis of other 4-hydroxycoumarin derivatives. This article aims to investigate the optimal condition in synthesis of 4-hydroxycoumarin.
前言：目的：4 -羟基香豆素是合成其他4 -羟基香豆素衍生物的关键中间体，本研究摸索出了合成4 -羟基香豆素的最有效条件。
While the Digital Intermediate Frequency technology is one of the pivotal technology in the wireless base station system.
而数字中频技术是无线基站传输系统中的关键技术之一。
While the Digital Intermediate Frequency technology is one of the pivotal technology in the wireless base station system.
而数字中频技术是无线基站传输系统中的关键技术之一。
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