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Pick out the wrong statement. | |
A. | Sand & coke is the main raw material for the manufacture of silicon carbide. [Wrong Answer] |
B. | Carbon refractories can not be used in the furnaces operating under reducing conditions. [Correct Answer] |
C. | Mullite can be obtained by the heating of alusite, kyanite or silimanite. [Wrong Answer] |
D. | Silica occurs in nature in all cellular, amorphous or crystalline form. [Wrong Answer] |