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粉煤灰三渣混合料中主要成分是SiO2和Al2O3,其含量应大于()。
- A、70%
- B、60%
- C、50%
- D、30%
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单选题粉煤灰三渣混合料中主要成分是SiO2和Al2O3,其含量应大于()。A
70%B
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50%D
30%
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