The earliest clepsydra was a copper pot holding water with a small opening at the bottom and a pole with scales standing in the center. When the water dropped through the small hole, people determined time by the scale on the pole as the water level decreased.

最早的漏壺用一只銅壺盛水婷婷精品在线视频，壺底有一個(gè)小洞看黄片二级，壺中插一根刻有刻度的標(biāo)桿，水從小洞滴出后国产污视频网站在线观看，人們根據(jù)水位降低后標(biāo)桿上的刻度來判斷時(shí)間H色视频网站。

When it rains in the Petén, mosquitoes swarm in such clouds that today's Maya have to drive them away with greasy smoke from torches burning cohune palm nuts. In the dry season, the heat bakes the swampy bajos , or bottomlands, the rivers fall, and drought threatens.

佩滕地區(qū)一旦下雨，蚊子便如鳥云般成群涌現(xiàn)日韩高清视频免费观看，現(xiàn)在的瑪雅人就必須以火炬燃燒羽葉棕櫚果實(shí)未满十八禁止18以下免费的AV，用帶油脂的煙驅(qū)趕它們，到了干季免费视频啪啪538，熱氣炙烤著遍布沼澤的洼地欧美性爱影视网站；河川水位降低，干旱隨時(shí)會(huì)降臨本地自拍日韩在线观看网站视频。

There will be 54×10^8 m^3 of saline groundwater can be used if the water level declines to 10m depth in the Hebei Plain in avoiding the seawater infall.

經(jīng)計(jì)算亚洲三级小说，若將地下咸水水位降低到10m，在避免海水人侵的情況下狼友最新视频首页入口，河北平原將有54×10^8立方公尺的咸水可以利用亚洲三级综合。

Because of the high water level and large permeability in sand, the cement mixing pile was also used as the anti-seepage pensile curtain, and deep-well system was set up at the same time to depress the water line.

場地水位高且與閩江有直接水力聯(lián)系，砂層滲透系數(shù)大嘿咻视频视频在线网站，設(shè)計(jì)最大坑內(nèi)水位降深為11m伊人手机在线观看，通過設(shè)置水泥攪拌樁懸掛止水帷幕，采用深井降水系統(tǒng)成功地降低了坑內(nèi)水位欧美添逼视频。

The water often becomes saltier because of the concentration of minerals.

這是因?yàn)殍駱湔趄v率非常高欧美图色第一页，這水渠從導(dǎo)致地下水位降低土壤水分。

By comparing the landslide displacement and the shearing strain increment under different water level condition, discovered that along with the rising water level, the displacement and the shearing strain increment of Taping landslide are obviously increased, it is show that the landslide has the obvious response to the storage, the water rise cause the stability of landslide present the reduction tendency.

通過不同水位狀態(tài)下滑坡位移和剪應(yīng)變增量的分析，發(fā)現(xiàn)美国一级网站，隨著水位的上升久久99国产综合精合精品免费，塔坪滑坡的位移及剪應(yīng)變增量都明顯增大，說明滑坡對(duì)蓄水有明顯的響應(yīng)啊啊啊免费啪啪啪视频，水位上升使滑坡的穩(wěn)定性有降低的趨勢free欧美性婬妇XXXX。

A relative low lake level between 8660～6010 cal.yr BPwas reflected by the clayey silt sediment with the median size less than 25μam and the sandcontent less than 4%,and the Pediastrum concentration was normally low.Between 6010 and2250 cal.yr BP,the median size and sand content increased greatly,and the Pediastrumconcentration raised sharply,suggesting a relative low lake level.After 2250 cal.yr BP,boththe median size and the Pediastrum abundance abruptly declined,suggesting the lake returnedto high level and the climate changed to humid.

UG04孔硅藻記錄重建的湖泊水位變化基本上支持孢粉重建的古植被和古氣候：8660～7230 cal.yr BP硅藻組合以浮游類主導(dǎo)，浮游／底棲比達(dá)40以上18禁黄网站禁片无码观看，指示水位較高亚洲色图图片专区，氣候略濕潤；7230～2330 cal.yr BP浮游類硅藻豐度和浮游／底棲比降低久热日韩视频免费无码观看网站，湖泊處于低水位中文图小说视频，氣候干旱；2330～930 cal.yr BP浮游類硅藻豐度和浮游／底棲比增加日韩美欧精品人妻，湖泊水位升高，氣候濕潤亚洲欧美精品综合久久小说。

A mass of experiments validated that exploitation and rational utilization of saline shallow groundwater, declining the water level to an optimal depth to reducing water invalid evaporation can increase amount of water resources and storage capacity of aquifer, prevent waterlogging or drought, improve groundwater salinity and control the process of soil salination, improve the eco-environment, alleviate the threat for the resource of fresh water.

大量的實(shí)驗(yàn)證明中文字幕国产精品一区，合理開發(fā)利用淺層咸水，使咸水水位降低到合理水平男人的天堂网免费网站，可以：避免地下水的無效蒸發(fā)先锋影音最新AV看片资源，增加水資源量；增強(qiáng)調(diào)蓄能力和抗早防澇能力免费人成黄页在线观看国际；促進(jìn)淺層咸水淡化在线黄色AV观看，改造鹽堿地，改善生態(tài)環(huán)境人人操人人操人人舔；減輕對(duì)淡水資源的威脅安卓官网番茄社区。

Trashrack plugged into the lower pool water level.

攔污柵堵塞，進(jìn)水池水位降低人人看人人亲人人操。

In operation, the alignment and the magnetic reed switch with the position of the float should be to reduce the water level, whichever is automatically cut off power supply to achieve the purpose of automatic water level should be repeated reed switch off electrical calibration sensitivity.

在操作過程中一级a爱做片2，調(diào)準(zhǔn)干簧管和磁性浮子的配合位置應(yīng)以水位降低能自動(dòng)切斷電源為準(zhǔn)，從而達(dá)到自動(dòng)控制水位的目的欧美三级片国产免费性爱视频，應(yīng)反復(fù)校準(zhǔn)干簧斷電器的靈敏度最近免费中文字幕视频在线MV。

high water mark：高水位線

執(zhí)行了收縮操作后,表內(nèi)的數(shù)據(jù)將被集中,且數(shù)據(jù)段的高水位線(high water mark)將被降低. 這將使全表掃描需要訪問的數(shù)據(jù)塊(block)更少,掃描更迅速. 數(shù)據(jù)段收縮屬于聯(lián)機(jī)操作,當(dāng)表的數(shù)據(jù)段被收縮時(shí),此表依然可以進(jìn)行查詢或 DML 操作. 此外,

water lowering：水位降低

water level 水平面 | water lowering 水位降低 | water meter 水表

sexagesimal circle：六十分制度盤

水位降低,水面下沈,聚落,沈陷 settlement | 三腳架下沈 settlement of tripod | 六十分制度盤 sexagesimal circle

Compart mentalized reservoir：斷塊油藏

Pressure drop 壓力降 | Compart mentalized reservoir 斷塊油藏 | Draw down (抽油后)水位降低久久国国产免费999、水位量降低

dewatering：降低地下水位;脫水

device 裝置;裝備 | dewatering 降低地下水位;脫水 | diagnostic test 診斷測試

dewatering：降低地下水位;抽水

deviator stress 軸差應(yīng)力;偏應(yīng)力;主應(yīng)力差 | dewatering 降低地下水位;抽水 | dial gauge 千分表

dewatering method：降低地下水位法

7 pore-pressure distribution孔壓分布 | 8 dewatering method降低地下水位法 | 9 well point system井點(diǎn)系統(tǒng)(輕型)

dewatering method：基坑開挖與降水降低地下水位法

466 16. 基坑開挖與降水 減壓井 relief well | 467 16. 基坑開挖與降水 降低地下水位法 dewatering method | 468 16. 基坑開挖與降水 井點(diǎn)系統(tǒng) well point system

dewatering method：地基處理降低地下水位法

582 19. 地基處理 漿液深層攪拌法 grout deep mixing method | 583 19. 地基處理 降低地下水位法 dewatering method | 585 19. 地基處理 坑式托換 pit underpinning

screw pump：螺旋泵

由於入水位降低,污水要泵至高於海水水位再作隔篩處理,然后排放到海里,所需的水壓亦要大幅度提升,泵水系統(tǒng)會(huì)由現(xiàn)時(shí)的螺旋泵 (screw pump)改為離心泵. 新的灣仔東污水隔篩廠內(nèi)的泵房有四臺(tái)主泵加一臺(tái)備用泵,