【摘 要】
：
三江平原地势低平、土地连片、土壤肥沃。但是由于洪、涝、渍的影响，粮食产量很低，效益不高，为此．黑龙江省三江平原水利试验站的科技人员从80年代就开始了地下暗管排水的试验。近
论文部分内容阅读
三江平原地势低平、土地连片、土壤肥沃。但是由于洪、涝、渍的影响，粮食产量很低，效益不高，为此．黑龙江省三江平原水利试验站的科技人员从80年代就开始了地下暗管排水的试验。近年来，根据国内外经验结合当地实际情况，采取一种缝、沟、管网络进行组合排水的方法，收到了?
Sanjiang Plain low-lying, contiguous land, fertile soil. However, due to floods, floods and stains, the output of grain is very low and the returns are not high. Sanjiang Plain Water Experimental Station in Heilongjiang Province, science and technology personnel from the 80’s began underground pipe drainage test. In recent years, according to the experience at home and abroad combined with the local actual situation, to take a seam, ditch, pipe network drainage combination method, received?
其他文献
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
以前日本NKK公司福山制铁所厚板厂３号间歇式加热炉由于排热回收装置能力受到限制，从节约能源出发，于２０００年４月采用了蓄热式燃烧器在厚板厂３号间歇式加热炉中应用，并取得很好的效果。该３
Slope aspect is one of the indispensable internal factors besides lithology,relative elevation and slope degree.In this paper authors use information value mode
本届巴城游泳世锦赛最扣人心弦、最令人拍掌称颂的,莫过于女子4×100米混合接力了。新世纪我国游坛绽放出来的四朵金花,向人们展现出非凡的竞技能力和优秀心理品质,奏响一曲
《童话》有丰富的战斗技能,也有丰富的工作技能,但是更丰富的是宠物系统。宠物有7种属性,每个属性都有18种宠物,100多种的宠物因为属性不同,幻兽的体质、力量、敏捷等数值也
Based on research advances of the tectonic regime in Jiaodong ore cluster area and the related tectonic regime transformation in Mesozoic era in the eastern reg
从亚里斯多德时代开始,人们一直不能确切地描述出鹅卵石的形状,过去大多数学者都是用“纵横比”来表征鹅卵石的形状,所谓”纵横比“就是一块鹅卵石的长轴与短轴之比.但这个参
The study area,located in the southeast of Tibet along the Sichuan-Tibet highway,is a part of Palongzangbu River basin where mountain hazards take place frequen
Gas hydrate, mainly composed of hydrocarbon gas and water, is considered to be a clean energy in the 21st century. Many indicators such as BSRs (Bottom-Simulati
为确保三峡工程帷幕灌浆质量，寻求合理的施工技术参数、适宜的灌装材料和施工工艺，在右岸导流明渠底板进行了帷幕灌浆试验，试验灌浆段长715．2延m。试验结果表明，采用小口径高压灌