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In the next area, We'll concentrate on and report on many of the commercial troubles for silicon photo voltaic cells.得到高纯度的多晶硅后，还要在单晶炉中熔炼成单晶硅，以后切片后供集成电路制造等用。If your incident light ray slipping on to the indicatrix is parallel for the z axis with the picked out coordina