Local application high - temperature - resistant foaming triphase profile control agent - group had perfect effects and the cost was low.

应用高温 三相 泡沫调剖剂实施井组整体调剖后,封堵效果好,成本低.

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In case of the discharge lamps some triphase symmetrical circuit and varied unsymmetrical circuit are studied.

本文分析了大量采用气体放电灯照明时,三相对称电路和多种典型的不对称电路.

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