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.

基巖標是重要的測量基準設(shè)施日本A级黄色网站，在洋山深水港東海大橋的工程建設(shè)中發(fā)揮了控制測量與高程傳遞的重要作用国产精品人人爽人人做。

As we known, common Loran - C receiver employs a fixed da- tum - mark in order to avoid interference caused by skywave, as the SNR is often poor at this point due to the amplitude limit of the pulse envelope, so it greatly increases time for tracking the datum - mark.

常規(guī)接收機為了防止天波干擾，將基準點設(shè)置在一個固定位置上国产精品一区久久久久久，導(dǎo)致基準點處信噪比受包絡(luò)限制而較低一级不卡黄片，從而大大增加了對準基準點的時間。

The surface subsidence in the Yellow River delta foreland area brings changes to the land surface height there, and the depth datum in the bathymetric survey is determined on the basis of the level of land bench mark, so the changes in the level of land bench mark will affect the determination of depth datum and the accuracy of bathymetric survey.

國家海洋局www网站啪啪啪性交黄，第一海洋研究所av全国最大的黄色网站，山東青島 266061文章摘要：黃河三角洲前沿的陸地由于受地面沉降的影響，使地面高程不斷發(fā)生變化黄色视频免费入口处在线观看。在水深測量中涩涩网站视频，深度基準面是根據(jù)陸地水準點高程確定的，陸地水準點高程的變化影響深度基準面的確定一级黄色毛片视频免费，從而影響水深測量的準確性欧美一,二..三性爱。

datum mark：基準記號

datum location 基準地點 | datum mark 基準記號 | datum plane 基準面

datum mark：水準點

datum 基準面 | datum mark 水準點 | daubing 石面鑿毛

reference point, zero point, datum mark：基準點

基準標高datum grade | 基準點reference point, zero point, datum mark | 基準線reference line, zero line