

MCQOPTIONS
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1. |
THE_THICKNESS_OF_THE_BASE_MATERIAL_OF_A_RAPID_SAND_FILTER_ON_WHICH_FILTER_MEDIA_ARE_SUPPORTED_IS?$ |
A. | 45-60cm |
B. | 20-80cm |
C. | 30-75cm |
D. | 10-30cm |
Answer» B. 20-80cm | |