| http://www.w3.org/ns/prov#value | - 07 Jun 2004, 09:12 rrr wrote:Question: Photovoltaic cells are made of two thin layers of material, one of them being a semiconducting material such as silicon, the other a metal such as aluminum or silver.(A) one of them being a semiconducting material such as silicon, the other a metal such as aluminum or silver(B) one of them being a semiconducting material such as silicon, the other being a met
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