需水,water demand
1)water demand需水
1.The paper chooses 365 cities to study the current situation of water demand,water supply and water shortage.选取了全国365个城市作为研究对象,进行城市需水、供水和缺水分析,并按照六大分区统计汇总。
2.water demand forcasting is the effective way to plan and manage the water resources.需水预测是进行水资源规划和管理的有效手段,尤其是在世界上不少城市和地区面临缺水局面的今天,如何合理而准确地预测未来的需水量以避免投资的浪费或减少将来用水危机的发生就显得更为重要。
英文短句/例句

1.This suit needs dry cleaning and these shirts are to be washed .这套衣服需要干洗,这几件衬衫需水洗。
2.isoline map of crop evapotranspiration作物需水量等值线图
3.Not requiring water, as a cooling system.不需水的,如一冷却系统
4.and necessities (food, water).必需品(食物,水)。
5.More grain needed means more water needed.需要更多谷物意味着需要更多的水。
6.These plants need watering every day.这些植物需要每天浇水。
7.The garden is crying out to be watered这个花园需要马上浇水。
8.We need numerous drinking water.我们需要大量的饮用水。
9.We need some water and vegetables.我们需要一些水和蔬菜。
10.We need someone to pour.我们需要人斟茶倒水
11.biological aerobic treatment of wastewater废水需氧生物处理法
12.seals without the application of moisture.不需要用水就可以封口。
13.What do we need for the fruit salad?做水果沙拉你需要什么?
14.The plants are starving for water.这些植物极需要水。
15.The bathtub drain needs repairing.浴盆的下水道需要修理。
16.Does electric - arc furnace need water too ?电弧炉也需要水吗?
17.biochemical oxygen demand meter for seawater海水生化需氧量测定仪
18.Water is essential for life – to drink, bathe, cook,clean, grow food, fuel engines, support ecosystems.水是生命必需品,饮用、沐
相关短句/例句

Water requirement and consumption需水耗水
3)ecological water demand生态需水
1.Frame of research work on ecological water demand and key topics;我国生态需水研究体系及关键研究命题初探
2.Quantitative research of ecological water demand based on GIS;基于GIS技术的生态需水量化研究
3.Wastewater recycling for ecological water demand of Shenzhen River-Bay system;深圳河湾水系生态需水的污水资源化
4)ecological water requirements生态需水
1.Discussion on the ecological water requirements in electric power engineering;论述电力工程的河流生态需水
2.Analysis of ecological water requirements in Yalong River of West Route of South-to-North Water Transfer Project;南水北调西线一期工程雅砻江河道内生态需水量研究
3.In this paper,the meanings and characteristics of ecological water requirements and ecological irrigation water requirements for urban greenspace system are defined,and the methods are built up.界定了城市绿地生态需水和生态灌溉需水的内涵与特征,构建了城市绿地生态需水和生态灌溉需水的计算模型,对黄河流域45个地级以上城市的绿地生态需水与生态灌溉需水进行计算与分析。
5)water requirement需水量
1.Analysis of water requirement for urban ecological environment at present in Yinchuan;银川市城市生态环境需水量现状分析
2.Present utilization situations of water resources in Yuncheng and water requirement prediction;运城市水资源利用现状及需水量预测
3.Analysis on water requirement of vegetations of woodland and meadow in the Wulanchabu league under ecological environment;水约束下乌兰察布盟林草植被的需水量分析
6)environmental water requirements环境需水
1.On the conception and connotation of ecological and environmental water requirements and uses;生态、环境需水与用水概念辨析
2.The paper study on the conceptions of ecological water requirements,environmental water requirements,ecological and environmental water requirements and ecological water uses,also research on the calculation approach of home and abroad eco-environmental water requirements.生态环境需水量的研究还处于起步阶段,对于其内涵尚无统一的界定。
延伸阅读

植物需水量  植物全生育期内总吸水量与净余总干物重(扣除呼吸作用的消耗等)的比率。由于植物所吸收的水分绝大部分用于蒸腾,所以需水量也可认为是总蒸腾量与总干物重的比率。如用每形成 1克干物质需要蒸腾水分的克数表示,则称蒸腾系数。如稻的蒸腾系数为680,小麦为540,玉米为370(见表)。系数愈大则水分利用效率愈低。蒸腾系数的倒数,即植物每蒸腾失水1000克所形成干物质的克数称蒸腾效率,其值越大则水分利用效率越高。一般植物的蒸腾效率为1~8。各种作物的水分利用效率不同。一般四碳植物的需水量低于三碳植物。这与两者的地理起源不同,形态、结构、生理、生化特性以及由此所决定的光合效率不同有关(见光合作用)。四碳植物由于有较高的光合固碳效率,一般气孔频率低于三碳植物,因而增大了气孔对水分的阻力,减少了蒸腾失水,提高了水分利用效率。同一种作物的需水量,还常因其他条件变化而异,如在土壤缺乏氮、磷、钾等无机营养时,水分利用效率降低,需水量增加。参与水分代谢的水分称生理需水。由于土面或棵间蒸发以及因径流与渗漏等而需要消耗的一定量水分,则并不被吸入植物体内参与水分代谢,只具有调节生态环境中水平衡的作用,因而可称为生态需水。灌溉时计算的作物需水量实际上是生理需水与生态需水的总量。作物需水量的测定,对计算农业用水、灌溉定额以及选择适合干旱地区栽培的作物类型等都具有重要意义。