The principle and scheme of selective control on process variables of LPG absorbing tower by use of DCS is explained in detail, including the selection and implementation of field instrument.

本文详细介绍了应用d C s对液化气吸收塔的工艺参数实现选择性控制的原理和方案，以及现场仪表的选型和实施。

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In this paper, the three major factors, namely the selection of rolling process, the synchronous adjustment and the design of rolling dies are expounded in detail.

详细阐述了滚轧工艺的选择、同步调整和滚轧轮设计等三要素。

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The paper describes in detail the principle of tone variance on silk, selection of dyestuff, dyeing process and operation.

文中对变色丝绸的变色原理、变色染料的选用、染色工艺及操作方法进行了较详细的论述。

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Darwin showed in detail how life changes over the course of time by the process of natural selection, but failed to explain how those changes can take different courses, dividing a species in two and thus multiplying the number of species.

ECONOMIST: Evolution