Question

Draft tubes _____ crystal-crystal attrition. Crystals _____ bottom.

a.

Increase, should be kept on

b.

Increase, should be kept off

c.

Decrease, should be kept on

d.

Decrease, should be kept off

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Answer: (d).Decrease, should be kept off

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Q. Draft tubes _____ crystal-crystal attrition. Crystals _____ bottom.
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