A. 20 to 30
B. 15 to 45
C. 25 to 40

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C. 25 to 40
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A. Silica
B. Silicon
C. Clay

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A. Silica
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A. Silicon
B. Zinc
C. Alumina

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C. Alumina
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A. One
B. five
C. three
D. four

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A. One
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1 3 4 5