Yinchuan, Aug. 20 (Xinhua) 277 deals worth approximately 156.7 billion yuan (appx. 24 billion U.S. dollars) have been signed at the ongoing fifth China-Arab States Expo in northwest China's Ningxia Hui Autonomous Region. The deals cover various fields including electronic information, clean energy, new materials, green food, and tourism cooperation. Among them, investment of nearly...