The Al2 O3 content of cryolite in Hall-Heroult's cell is maintained be

1.	The Al2 O3 content of cryolite in Hall-Heroult's cell is maintained between __________ percent.
A.	43587
B.	18-20
C.	42339
D.	43805
Answer» B. 18-20

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The Al2 O3 content of cryolite in Hall-Heroult's cell is maintained between __________ percent.

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