对ZY 47型自力式压差控制阀和ZL47型流量控制阀进行了性能实验，并依据它们的结构特点和工作原理，提出了选型方法。
Performance experiments about ZY47 pressure -difference control valve and ZL47 flux control valve have been done, based on their structure and work principle, presented the method of type selection.
本文概要介绍了目前主要的三种数据库接口技术，并对它们的接口原理和性能特点进行了分析与对比。
In this paper we introduce three prime interface techniques of Web Database at present, analyzing and comparing their interface theories and performances.
对各种便携式硬度计进行了分类，对它们的各自的特点和性能以及影响试验结果的因素进行了详细的对比分析。
This article has class the portable hardness testers, and has analyzed their special performances and the influence factors for the results in detail.
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