【摘 要】
：
In the past, football fan Zhang Chengyuan had to cycle quite a distance to the nearest football field from his home. But since the construction of a football fi
论文部分内容阅读
In the past, football fan Zhang Chengyuan had to cycle quite a distance to the nearest football field from his home. But since the construction of a football field in his neighborhood in Chaoyang District in Beijing three years ago, it takes him only 10 minutes to go kick a ball around.
其他文献
随着含氟磷酸铁锂在二次锂离子电池正极材料中的应用，含氟聚阴离子型化合物受到了人们的关注，但是在合成化学上多个阴离子基团的引入存在一定的难度，使得含氟或卤素磷酸盐化合物
质子交换膜燃料电池目前普遍使用全氟磺酸膜,膜的水含量直接影响质子在膜中的传导和膜的机械强度,并进一步影响电池性能,因此保持膜的适度湿润性非常重要。通常采用各种增湿方法来对反应气进行增湿,但这会增加系统的复杂性以及体积和重量,为了简化系统,提高系统的体积比功率和质量比功率,近年来,出现了很多从电池材料和结构入手进行优化设计的自增湿方法,但效果都不是很理想,也还没有完全实用化。本文从实现燃料电池自增湿
The Golden Valley is a dazzling 48-km belt in Zuoquan County in Shanxi Province, north China, named so after its variety of trees with bright yellow leaves that
The assembly line of Chengdu Huachuan Electric Parts Co. in Chengdu, Sichuan Province in southwest China, presents a busy sight with robotic arms and intelligen
Zhou Xinfang considers 2017 to be a year of “earth-shaking change” for her family. It was the year the family moved from their remote village in Zuoquan Count
由于人类对海洋资源的无序开发，海洋生态系统面临着环境恶化、结构失调、功能衰退等诸多问题，并逐渐制约海洋的可持续发展。海洋生态修复作为当前缓解生态系统退化压力、恢复受
President Xi Jinping gave another shot in the arm to the China International Import Expo (CIIE), a major platform he had initiated to bolster global trade, by a
On October 22, a ceremony was held to hand over the first 4,000 of the 30,000 sheep gifted by Mongolia to China at the border region of Zamiin-Uud- Erlian. They
For years, spring was known as the sandstorm season in Beijing, when dust and sand whipped up from the Gobi desert in the north by high winds enveloped the city