1. Ordinary Evacuated-tubeSpecification:Structure:All-glass coaxial dual tubeGlass material:High borosilicate glass 3.3Diameter and length of tube(mm):47*1200, 47*1500, 47*1600, 47*180058*1500, 58*1600, 58*1600, 58*160058*1600, 58*2000, 58*210070*1800, 70*2000, 70*2100Solar se...
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