【摘 要】
：
———引黄灌区续建配套工程最近，国家计委、水利部批准了宁夏引黄灌区更新改造规划，审批总投资２１７亿元，重点对引黄灌区干支渠进行防渗砌护，对各类老化失修的建筑物、排灌站进行改
论文部分内容阅读
———引黄灌区续建配套工程最近，国家计委、水利部批准了宁夏引黄灌区更新改造规划，审批总投资２１７亿元，重点对引黄灌区干支渠进行防渗砌护，对各类老化失修的建筑物、排灌站进行改造。１９９８年第一批安排投资４２００万元，其中国家投资２４００万元。———黄...
Recently, the State Development Planning Commission and the Ministry of Water Resources approved the plan for the renovation and renovation of the Yellow River Irrigation District in the Yellow River with a total investment of 2.17 billion yuan, focusing on the seepage control of dry and branch channels in the Yellow River Diversion Irrigation District, Various types of aging buildings, irrigation and drainage stations to transform. The first batch of arrangements in 1998 invested 42 million yuan, of which 24 million yuan was invested by the state. ---yellow...
其他文献
巴西辛戈电站是世界上最大的由数字式调速器控制的水电站。讨论了采用这种数字技术的意义。
Sinseo, Brazil’s largest hydropower station controlled by a digital gover
被誉为辽南果乡——瓦房店市驼山乡,有11个村、96个居民组、2.2万余人口。乡司法助理员荆友凯整天就在这里的田间、村头和乡亲炕边办公事。10几年来,他跑遍所有村屯,走访上
广州开发区实行“四区合一”的管理体制,即“广州经济技术开发区”、“广州高新技术产业开发区”、“广州出口加工区”、“广州保税区”(以下简称广州开发区)四个国家级经济
Bedrock weathering and atmospheric deposition are the two primary sources of base cations (K+, Na+, Ca2+ and Mg2+) to forest ecosystems. Therefore, the key prob
王景祥,1920年3月出生于顺义区木林镇陈各庄村。13岁当小伴伙儿,17岁扛长活,土改后参军入党,五次立功受奖。1952年4月,他复员回到家乡。
Wang Jingxiang, born in Mar. 1920
Palygorskite is a natural clay mineral characterized by a porous crystalline structure containing tetrahedral layers alloyed together bylongitudinal sideline ch
Cretaceous sediment is considered to be the important oil reservoir in the Songliao Basin, which is dominated by continental fluvial and lacustrine strata. In t
1.逐步破除垄断行为,化小垄断利润。(1)破——对垄断企业进行分割,削弱其垄断力。具体说,对垄断企业的分割可分为业务分割和区域分割。如中国邮电业务被分割成邮政和电信的
20世纪60年代中期,苏联教学论专家马赫穆托夫创立并推行了问题式教学法。所谓问题式教学法是指:在课堂教学过程中,教师以不断提出问题、解决问题的方式让学生获取新知识的一
A pertubation method for the steady entrance flow through a convergingdiverging pipe, which can model an arterial stenosis at the initial stage, is presented. A