Several techniques were studied and improved.
若干技术进行了研究和改进。
The process of synthesis potassium sulfate by phosphogypsum double salt method was studied and improved.
对磷石膏复盐法制备硫酸钾工艺进行了研究和改进。
The control strategy of single-phase two-stage grid-connected PV (PhotoVoltaic) generation system is studied and improved.
研究并改进了单相两级光伏并网发电系统的控制策略。
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