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				| 1. | In sedimentation, l – clear liquid zone, t- thick suspension zone, s- solid zone. With concentration of solids as the y-axis and the time as the x-axis, which curve does the following represent? | 
| A. | l-t interface | 
| B. | t-s interface | 
| C. | t zone | 
| D. | none of the mentioned | 
| Answer» C. t zone | |