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1. |
The effective area of the diffuser plate used in the aeration tank is |
A. | 400cm<sup>2</sup> |
B. | 780cm<sup>2</sup> |
C. | 1160cm<sup>2</sup> |
D. | 800cm<sup>2</sup> |
Answer» C. 1160cm<sup>2</sup> | |