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  1. For the manufacture of Portland cement, the proportions of raw materials used, are

    2. A.

    lime 63% ; silica 22% ; other ingredients 15%
    B.

    lime 22% ; silica 63% ; other ingredients 15%
    C.

    silica 40% ; lime 40% ; other ingredients 20%
    D.

    silica 70% ; lime 20% ; other ingredients 10%.

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    Answer : Option A

    Explanation :

    No answer description available for this question.

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