direct component modal synthesis method 直接分支模态综合法
direct method and fourier synthesis 直接法和fourier综合
The direct synthesis method has the merits of requiring no calcining shorter producing period and lower costs.
直接法的优点在于产品不必经过焙烧， 生产周期短，成本低等。
Therefore, it is advantageous to use a direct synthesis method without optimization whenever this is applicable.
所以，使用一个直接综合方法没有优化是有利的，每当这是可适用的。
A detailed study for the synthesis of hexabromobenzene by means of direct bromination has been conducted, and some modifications to the classical method were proposed.
对直接溴化法合成六溴苯作了系统的研究，并对文献方法进行了一系列的改进。
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