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				| 1. | Normally what is the pressure under which centrifugal blowers operate? | 
| A. | 0.35-0.7 kg/cm<sup>2</sup> | 
| B. | 0.5 -0.7 kg/cm<sup>2</sup> | 
| C. | 0.35 kg/cm<sup>2</sup> | 
| D. | 0.35-0.5kg/cm<sup>2</sup> | 
| Answer» B. 0.5 -0.7 kg/cm<sup>2</sup> | |