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

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Question: For the manufacture of Portland cement, the proportions of raw materials used, are

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

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

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

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

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