在上述研究的基础上，作者提出了选用这两种方法的原则，供企业管理者参考。
On the basis of the previous researches the author puts forward the principle in selecting the two methods for the reference of business managers.
对比例阀的选用原则提出了参考意见。
The reference opinion for the selection principle of the proportional valve has been put forward.
根据南水北调东线工程的特点、要求和现状，提出工程梯级泵站、机组结构与功能选用原则。
Based on the present situation, characteristics and demands of Eastern Route South to North Water Transfer Project, several principles for selecting pump stations and pump units are put forward.
应用推荐