青年中文pre concentration的意思
pre concentration中文翻譯：
n.預選；預濃縮；預先富集
pre───abbr.煉油工程師（PetroleumRefiningEngineer）
concentration───n.濃度；集中；濃縮；專心；集合
impurity concentration───[電子]雜質濃度
pre reading───adj.閱讀前的
pre out───前輸出
high concentration───高濃度，高強度
concentration curl───[體]單臂啞鈴彎舉
pre pay───vt.預付；提前繳納
concentration camps───n.集中營( concentration camp的名詞復數 )
concentration of atmospheric carbon, an important indicator of global warming, has shot from 280 parts per million in pre-industrial times to 386 PPM last year and appears to be accelerating.───全球變暖的重要指示——大氣的碳濃度——已經從工業社會前的280ppm (parts per million)激增到386 p pm，而且這一速度似乎還在增加。
effects of reaction conditions were studied, including the kind of solvent, polymerization temperature, the concentration of template and initiator, rotational speed and pre-polymerization time.───考察了聚合反應條件，如溶劑種類、聚合溫度、模板濃度、引發劑用量、轉速、預聚合時間等對分子印跡聚合物微球特性的影響。
method for the spectrophotometric determination of trace Cu 2+ with flow injection liquid liquid extraction separation and pre concentration was developed.───用自制的分相器與流動注射儀聯用，對有機相析出液- 液萃取光度法測定微量銅的流路參數和操作程序進行優化。
This method achieved a very low limit of detection by pre-concentration to satisfy the requirement of detection of trace estrogens in water.───該方法主要針對水中的痕量雌激素，采用對樣品進行富集和測定，從而大大地降低了檢測限。
Research of Conditions of Trace Plumbum Pre-Concentration from Water on a Cylinder of Activated Carbon Using Dithizone as a Chelating Agent───雙硫腙-活性炭柱富集分離水中痕量鉛的條件研究
Application of Pre-concentration of hematite and Exploration of a New Magnetic Separation Technology at Gushan Mine───姑山赤鐵礦預選工藝的應用及磁選新工藝的探索
Simultaneous Determination of Trace Nb, Ta, Zr, Hf in Geological Samples by AES after Separation and Pre-concentration with Tannic Cotton───丹寧棉分離富集-發射光譜法同時測定地質樣品中微量鈮鉭鋯鉿
Dynamic Pre-concentration of Light Hydrocarbons at Room Temperature───低碳烴的常溫動態預濃縮方法
Flow Injection On-line Double Micro-column with Chelating Resin Pre-concentration System for Cu, Pb, Cd and Mn Determination by FAAS───流動注射在線螯合樹脂雙柱預富集火焰原子吸收法測定痕量銅、鉛、鎘和錳