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1. |
What is the surface area of the plastic high specific surface area packing material used in trickling filters as the packing medium? |
A. | t60 m<sup>2</sup>/m<sup>3</sup> |
B. | t90 m<sup>2</sup>/m<sup>3</sup> |
C. | t140 m<sup>2</sup>/m<sup>3</sup> |
D. | t45 m<sup>2</sup>/m<sup>3</sup> |
Answer» D. t45 m<sup>2</sup>/m<sup>3</sup> | |