datum 中文意思是什麼

音標 ['deitəm]
datum 解釋
n. 名詞 （pl. data ） 〈拉丁語〉1. 〈常 pl. 〉 數據，資料。
2. 論據，作為論據的事實。
3. 【數學】已知數。
4. 【測】基點，基線，基面。

  1. This thesis taking the lead in systematically studying pleurocarpous mosses, is a part of the comprehensive research of bryophytes in hebei, which will provide datum for the statistics and analysis of bryophytes along with exploit and utility of plant resources in hebei, which will provide the first - hand material for the compilation of the ( ( flora bryophytarum hebeiensis ) ) and the ( ( flora bryophytarum sinicorum ) ). on classification system, the author references the classification systems about bryophytes and approves standpoint of vitt., considering that the place of capsule growing is the criterion of distinguishing acrocarpous and pleurocarpous mosses

    本研究採用了陳邦傑教授（ 1963 ）修正的reimers （ 1932 ）關于蘚綱植物的分類系統，同時，支持h . d . mitten （ 1984 ）的觀點，認為劃分頂蒴和側蒴蘚類植物的依據是孢子體著生的位置，其中側蒴蘚類植物是指蒴柄從葉腋中發生非著生莖頂的蘚類植物，分類系統上指從虎尾蘚科（ hdwigiaceae ） ?塔蘚科（ hylocomiaceae ）等。
  2. Potential is defined relative to an arbitrary datum.

    勢是相對于任意參考面而定義的。
  3. The deepest point is 66 metres below principal datum in lo chau mun ( beaufort channel ) north of po toi island

    最深的海?位於蒲臺島北邊的螺洲門，低於海平面66米。
  4. During construction of donghai bridge of yangshan deep - water port, bedrock bench mark, which is an important surveying datum mark, played an important part in control survey and elevation transmission

    摘要基巖標是重要的測量基準設施，在洋山深水港東海大橋的工程建設中發揮了控制測量與高程傳遞的重要作用。
  5. Starting with the changing process of village hamlet community, on the basis of literature and datum ， the writer investigates thoroughly a village on the boundary of fuqing and putian by the means of individual inquiry and research on the spot, describes the village hamlet community ' s formation and evolution process, emphasizes to expound the everyday life of the village hamlet community and clans with members of the same clan ' s blood line as well as the influence and function of this village ' s particular contacting network in the village hamlet community

    本文從了解農村的村落共同體變遷過程出發，在已有文獻和資料的基礎上，運用實地研究和個案訪談的方法，深入調查了一個地處福建省閩中地區福清市和莆田市交界的村落，描述了該村落共同體的形成與演化過程；著重論述了以宗親血緣關系為紐帶的宗族、村落共同體的日常生活表現以及該村獨特的共同體聯系網路在該村村落共同體中的作用與影響。
  6. The piezometric head is also measured from the same datum level.

    測壓水頭亦應從同一基準面算起。
  7. System safety design controls safety of datum from three aspects, " physics level ", " system level " and " data level "

    系統安全設計從「物理層」 、 「系統層」 、 「數據層」三個方面對數據的安全性進行了控制。
  8. A line of punch positions parallel to the y datum line of a punch card

    和卡片的y基準線平行的一行穿孔位置。
  9. Phase datum mark

    相位基準標記
  10. To use the athwart gradient protection which takes the end of dam as the datum mark will reduce the digging depth of the stilling basins is reducing, and increase the energy dissipation rate

    採用以壩體末端為基準面的壩體逆坡防護時，消力池挖深減小，消能率提高，壩面平均流速減小，壩區防護難度降低。
  11. Fourthly, according with the analyzing of flow measurement, we research the main problems needed to be solve in the process of measurement, such as analysis and measurement of the internal resistance, selection of excitation frequency, stable signal datum mark and restraining common mode interference, restraining for serial mode interference and working frequency interference ; transporting and shielding the flow signal, constant current excitation and magnetic field equalizing, flow measuring

    第四，根據對流量測量問題分析的，深入研究了設計過程中需要解決的主要問題。如內阻分析與測量;勵磁頻率的選擇;穩定信號基準點與抑制共模干擾;串模干擾與工頻干擾抑制;流量信號傳輸與屏蔽;恆流勵磁與磁場補償;流量測量點的選擇等。
  12. It not only gains the physical contrastive datum mark, but also improves the blm stability. cyclic voltammetry is used to study the characteristic of blm attached to metal surface, as the forming of blm, the voltammetric characteristics of blm, the selection of ion and measurement of different ki concentration

    就以上提出的處理方法，採用循環伏安法詳細研究了金屬表面所覆blm的基本性質，如：膜形成液的配製、膜的形成、膜電阻、膜的伏安特性、膜的擊穿電壓、離子的識別性及對不同濃度的碘化鉀溶液的測試。
  13. According to the system ' s operational order, this paper explains how to solve some problems in the correction system, for instance, successively displaying autocad files, finding datum mark, drawing compartmentalization, view recognizing, scale consistency, orientation consistency, processing simplified means and displaying correcting results this thesis is supported by northwestern polytechnical university " electronics teaching material budget

    本文依照批改系統的工作順序，闡述了解決盤蓋類作業批改系統的技術問題，重點表述了作業圖連續顯示、基準點定位、區域劃分、視圖識別、方向一致化、比例一致化、簡化畫法處理以及結果顯示方法的處理方法。
  14. Tidal height datum plane of the station

    測站潮高基準面
  15. The datum plane of system is made certain and its veracity is proven by experiment. the result indicate that the laser rotating check system has very high precision and sensitivity and display the check result with number

    得到的實驗數據表明：本課題研究的掃平儀檢測系統具有很高的檢測精度與靈敏度，並實現了檢測結果的數字顯示，在掃平儀的生產中具有一定的實用價值。
  16. Fourthly, this paper standardizes the linear of the inductance sensor and analyzes its error. then we discuss the angle error of the laser sensor and the datum plane error of the mechanism. finally, the paper gives some advice to improve the mechanism

    第四，此外，本文還對電感傳感器進行了線性校正及誤差分析，討論了激光傳感器傾角誤差，並對機械設計中的定位結構進行了誤差分析，提出了改進的措施。
  17. At present, a datum plane - conversion scheme is introduced in the sight system of active ground - to - ground missile. in this scheme the datum plane of sight system is transferred from inertia combination to missile terminal, and the angle of two datum planes is measured at the technical position

    目前，常規導彈在瞄準中採用了基面轉換方案，將導彈瞄準基面由慣性組合轉換到彈體尾段，兩基面夾角在技術陣地測量。
  18. First the sketch / datum plane is fitted by least - square distance, then the extruded direction or axis with the flank points of the cloud is extracted in quadratic paogramming arithmetic, and certain points projected to gain 2d sketched datas. feature points are defined to segment the sketch datas, and the sketch profile is generated by fitting separately the line and circle segment

    使用最小二乘方法擬合草圖基準平面，採用二次規劃方法提取拉伸方向和旋轉軸線，然後將數據點投影以獲取草圖數據，通過柵格劃分提取草圖邊界輪廓數據，再對這些邊界數據進行基於特徵點的分割，以直線和圓弧段擬合出草圖輪廓。
  19. Therefore, the method of screen spreading is presented herein with the following basic feature : taking the surface of the perpendicular line at the end of the distortion and bottom as the datum plane, move the controlling point of every distortion part to the datum plane with the principle of changeless of geometry size, and then the spreading is formed

    為此提出一種屏幕展開方法，此方法的基本要點是，以扭曲面末端垂直線和底部起坡線所在的平面為基準面，將扭曲面各分塊的控制點按幾何尺寸不變的原則搬到基準面，即可形成展開圖。
  20. In the different places the basal datum can be obtained from the drilling field through this system, in this way the technology resource and expert resource of different places can be taken full advantage to resolve the problem of technology weakness of the drilling team, and realize long - distance monitoring, long - distance direction, and long - distance management

    該系統可以通過internet對鉆井現場進行遠程監視，異地獲得現場基礎數據。這樣，可以充分利用異地的技術資源和專家資源解決井隊技術力量弱的問題，實現遠程監視、遠程指導和遠程管理。
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