This article presents the principles and some problems which should be noticed in a float bed and low speed counter-current softener.
本文介绍浮床和低速逆流软化器的原理以及必须注意的几个问题。
This paper introduces a frequency variable and velocity variable system using IPM. Some problems which should be noticed in applications are presented.
介绍一种应用智能功率模块的变频调速系统，提出了使用智能功率模块时应注意的关问题。
The paper analyzes several problems which should be noticed in concrete proportioning design and poses appropriate measures for prevention and treatment.
对混凝土配合比设计中值得注意的几个问题进行分析，并提出相应的防治措施。
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