The method can achieve the goal of power saving is proved by the practical use in site.
通过现场应用证明了该方法达到了节电的目的，具有较高的实用价值。
It is proved in use that the tools are practical with good results.
使用表明，这些工具实用效果好。
The instrument is proved by practical use to be an economical, stable and reliable instrumentation.
是一种经济实用和稳定可靠的过程溶液浓度自动测控仪器。
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