【摘 要】
：
Since ancient times, the Chinese government has always attached a great deal of importance to food security . However, the problems have been different at diffe
【出 处】
：
China & World Economy
论文部分内容阅读
Since ancient times, the Chinese government has always attached a great deal of importance to food security . However, the problems have been different at different times, with a variety of different solutions. For a considerably long period of time, production efficiency was low due to the planned economy. Food supply was in a constant state of shortage due to limited investment,
Since ancient times, the Chinese government has always attached a great deal of importance to food security. However, the problems have been different at different times, with a variety of different solutions. For a 58 to the planned economy. Food supply was in a constant state of shortage due to limited investment,
其他文献
Background: Limited data exist on the combined use of EUS guided FNA (EUS-FNA) and flow cytometry (FC) in the diagnosis of lymphoma. The aim of this study was t
Background: Many patients with high-grade dysplasia and localized adenocarcinoma in Barrett’s esophagus have localized disease but are either unfit for major s
1.关税和非关税措施 我国承诺,到2005年,把15％的平均关税水平降到10％。 工业品平均关税由现在17％左右下降到5年后的8.9％以下(汽车除外)。 农产品平均关税下降到5年后的17％以下。
随着我国经济发展和人民生活水平提高,消费已进入选择时代。消费需求的选择性决定我国零售商业发展运行轨迹,使得直接面向最终消费者的零售业在市场中占据主动。上海在这一
通过计算Z值的标准正态偏差及古登堡—里克特关系中的b值,研究了2003年台湾成功地震(Mw=6.8)之前台湾地区地震活动性图像的变化。在成功地震震源周围的Z值分布中可以识别出地
本刊讯(段金平)近日,由北京市水文地质工程地质大队编制的《北京市平原区地下水环境监测网运行》项目建议书顺利通过专家评审。该项目建议书将为2010年监测网顺利启动运行提
暑假期间,作为一名广告专业即将毕业的学生,我在一家规模并不是很大的广告公司作了两个月的兼职。这家广告公司业务范围主要在一些城镇和乡村为客户在墙体上刷制广告。比起
一、奥林匹克标志保护的背景奥林匹克标志既是奥林匹克精神的象征，也是奥林匹克运动重要的无形资产。我国对奥林匹克标志的保护经历了一个从行政保护到立法保护的发展过程。早
The various types of granite landforms in the Huangshan Mt. are distributed in a concentric pattern. The remaining parts of the planation surface are in the cen