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1. |
What is the height of the anthracite maintained in a dual media filter? |
A. | 1.5-1.8 m |
B. | 2.2 -2.4 m |
C. | 2.5-2.8 m |
D. | 2.8-3.0 m |
Answer» B. 2.2 -2.4 m | |