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				| 1. | What is the angle made by the sloping side when the trapezoidal channel discharges to the maximum extent? | 
| A. | 30° | 
| B. | 45° | 
| C. | 60° | 
| D. | 90° | 
| Answer» D. 90¬¨¬®‚Äö√†√ª | |