They also will study chemical and physical properties of the soil samples with a method called infrared spectroscopy.
VOA: special.2009.01.20
Developers have bought a lot of empty properties and have re-built costly apartments.
VOA: special.2009.04.27
And that sparse array of wires has exactly the same light absorption and electricity-collection properties as the conventional silicon wafer cell."
VOA: standard.2010.02.19
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