| 1 | Gansu Senzhengyuan Bio-Tech Co. , Ltd located at the Gansu Province Longxi County Wenfeng Town culture south road, neighbor Longhai yellow trefoil section railroad. | |
| 2 | Concept of courtyard eco-agriculture with biogas as a core was analyzed in this paper, taking Longxi County of Gansu province as example. | |
| 3 | An example of S7-300 applied in wastewater treatment is given . The method and application of design in wastewater treatment Base on PLC of S7 series build NET technology is introduced. | |
| 4 | There are superior conditions, including wide cultivating areas and strong process ability to cultivate potato in LongXi county of GanSu province, and the potato industry plays an important rol. |
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