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solar thermal
+
Exhibition
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Renewable Energy
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speaker
13
Wang Zhixuan
Sun Yucai
Robin Welling
Ragnar Baldursson
Robin Welling
Prof. Yin Zhiqiang
Tobias Schwindt
Steffen Schoft
Malte Kottwitz
Sven Tetzlaff
Zheng Ruicheng
Yu Jianwei
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