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

1.	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
Answer» E.

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

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