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1. |
Permutit has an exchange value of ________ grams of hardness per m3 of zeolite. |
A. | 10,000 |
B. | 20,000-30,000 |
C. | 35,000-40,000 |
D. | 40,000-50,000 |
Answer» D. 40,000-50,000 | |