principal datum是什么意思

网络释义

用法例句

This paper describes the development status and tendency of the overseas celestial navigation technologies,including double star localization based on the altitude difference method,multiple star vector localization based on the star pattern recognition,autonomous optical horizontal reference technology,radio celestial localization technology,etc.

叙述了国外天文导航技术的发展现状及其趋势,包括基于“高度差法”的两星定位技术、基于星图识别的多星矢量定位技术、自主光学水平基准技术、天文射电定位技术等,并概述了天文导航技术未来的研究方向。

A new method of optical horizontal reference measurement based on CCD sensor is presented .

提出了一种以CCD器件为传感器的光学水平基准的测量方法 ,具体介绍了以单片机 89C5 1为核心处理器的水平基准测量电路的软硬件设计。

metre above Principal Datum [mPd]

主水平基准以上……米

at right angles to the plane of the horizon or a base line.

与水平面或者基准面成直角。

Hydropower Project Three-dimensional Standard Parts Database Based on CATIA

基于CATIA平台的水电三维标准件模板库

Adjustment Programming of Level Net on the Basis of MATLAB

基于MATLAB的水准网平差程序设计

Basic English level (equilvent to or above high school).

基本的英文水准（相当与或高于高中水平）。

Study on Structure Design Guide and Global Strength Analysis of Spar Platform;

单柱式深水平台结构设计准则及主体强度初探

Practising ISO9000 Standard Management Technique in Order to Improve Democratic Management Level;

运用ISO9000标准管理技术提高民主管理工作水平

These are known as ″basic impulse insulation levels″ (BIL). Basic Impulse Insulation Level is expressed in impulse crest (peak) voltage with a standard wave not longer than a 1.2\50s wave.

基本冲击绝缘水平是以不长于1.2;50gs的标准波形冲击峰值电压表示的基准水平。

To measure the different elevations of(a tract of land)with a level.

测量水平用水准仪对（土地）做水准测量

Analysis of China′s Information Technology Level Based on the Networked Readiness Index;

基于网络准备能力指数来分析我国信息化水平

The enactment of the inspiring regulation and of the datum level on the civil aviation charge;

激励性规制与民航票价基准水平的设定

Spatial Autocorrelation Patterns of Datum Land Prices of Cities in a Region

区域城镇基准地价水平的空间自相关格局分析

Development of general leveling adjustment program based on VB6.0

基于VB6.0的加权自由水准网平差程序的开发

Appraisal of urban management level on primary component analysis;

基于主成分分析的城市经营水平评价

(c) where such market access opportunities for a product are greater than 30 per cent, the base trigger level shall equal 105 per cent.

（c）如一产品的市场准入机会高于30％，则基准触发水平应等于105％。

Criteria of Production are the Basic Principles of Marxism──On Deng Xiaoping s Socialism Essence;

生产力标准是马克思主义的基本原则——兼论邓小平社会主义本质观

Study on Water Quality Standards for Storm Water Infiltration Based on Risk Assessment in Pinggu Basin of Beijing

基于风险评价的北京平谷盆地雨洪水回灌水质标准研究

This fixture should be provided with a reference leveling surface, so that it can be kept level as the balance deflects.

这种装置应该有一个水平基准面，以便在天平变形时能够使之保持水平。