This paper introduces hydraulic vibration-exciting system for marble moulding machine, and pats forward rational selection method of vibration. parameter for the system controlled by rotary valve.
本文介绍了应用于再造大理石成型机的液压激振系统，并提出了应用转间控制的系统其振动参数的合理选择方法。
The harm of the high degree harmonic wave in power system was introduced and the selection of prevention and the measure of controlling the harmonic interference were put forward.
本文简要介绍电力系统中高次谐波的危害，以及选择的防治、抑制谐波干扰的措施。
By theoretical analysis, it defines a new concept-system critical filtration efficiency and puts forward a calculation and selection method of air filters.
通过理论分析，本文首次提出系统临界过滤效率的概念，并从中得出舒适性空调系统空气过滤器的计算和选择方法供参考。
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