LDK Solar and the U.S. National Renewable Energy Laboratory signed a Memorandum of Understanding	2019.06.15
China's solar photovoltaic industry is difficult to repeat,	2019.06.15
Yingli Energy intends to expand production capacity and four times to raise export prices	2019.06.15
Solar patents in increasing third-generation technology will lead the trend	2019.06.14

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