A. Because silicon can be used to make solar cells, so A is correct;
B Because the raw material to make optical fibers is silica, so B is wrong;
p>C , because water glass can be used as a flame retardant and adhesive, so C is correct;
D Since silicon carbide is an atomic crystal with high hardness, it can be used as an abrasive for paper glass and grindstones, so D is correct;
D p>
Then choose B.
Solar cells are made of simple silicon, usually tested for sheet silicate, while ceramic glass cement silica is usually tested for optical fibers and crystals.At present, the main types include: crystalline silicon solar arsenide solar cells gallium and thin film solar cells. Crystalline silicon solar cells are divided into sola cellsires in polycrystalline silicon and solar cells in monocrystalline silicon. Thin-film solar cells can be divided into polycrystalline silicon thin-film solar cells, microcrystalline silicon thin-film solar cells, amorphous silicon thin-film solar cells, dye-sensitized solar cells, selenide thin-film solar cells copper and indium, etc. The market is dominated by crystalline silicon solar cells, which account for 88% of the total solar cell demand. Among crystalline silicon solar cells, polycrystalline silicon solar cells account for a large proportion, accounting for nearly 2/3; monocrystalline silicon solar cells account for 1/3.