| 1 | The barrage closure works of Qingtongxia Key Water Control Project on Yellow River in China. | |
| 2 | There are about 20 gorges such as Longyang Gorge, Jishi Gorge, Liujia Gorge, and Qingtong Gorge. | |
| 3 | The paper summarizes the status of salinity soil in Qingtongxia Irrigation Distract, and analyzes the factors of its formation. | |
| 4 | The plain part starts from Qingtong Gorge to Hekou town. It has stable and slow riverbed. On both sides are the famous Yinchuan Plain and Hetao Plain. | |
| 5 | This thesis mainly depicts the application of OMRON PLC in box furnace control system, mentions the hardware organization, structure of software and principles of control. |
Copyright © Purple Culture Co., Ltd. 2001 - 2026. All right reserved.
