1) Pure background areas
清洁背景地区
2) clean area
清洁地区
1.
To explore the mechanisms responsible for formation and variation of O_3 at the surface in clean area and the effect of some relative gas on it,the variation characteristics of the surface O_3 and CO concentration over Mt.
为了探讨清洁地区地面O_3变化特征,相关物质对O_3生成与变化的影响,本文利用瓦里关大气本底观象台1994。
3) Geological background areas
地质背景区
1.
To effectively formulating the animal feed for cattle this study analyzed the concentration of potassium,magnesium,copper,zinc,manganese,cobalt,iron,selenium and iodin in rock,soil and forage from the main ruminant production bases,which belong to six different geological background areas in Yunnan province,China.
对云南省反刍家畜主要生产基地所属的6个地质背景区的土壤、岩石和饲料样品的钾、镁、铜、锌、锰、钴、铁、硒和碘等9种元素进行分析测定,结果表明:土壤和饲料中大多数矿物质元素含量在玄武岩(Ⅴ)和碳酸岩红壤区(Ⅰ)相对较丰富;碳酸岩盐、碎屑岩和玄武岩混合型黄红壤区(Ⅱ)居中;而由碎屑岩(Ⅲ)和变质岩(Ⅵ)发育的土壤区土壤和饲料中元素含量相对最低。
4) A surrounding area; a background.
背景周围的地区;背景
5) vegetable base in clean area
清洁区蔬菜基地
6) regional geological background
区域地质背景
1.
There are regional geological background and favorable regional geological factors of nitrate-mineralizing in Heishanwei region.
新疆鄯善黑山尾地区具备硝酸盐成矿的区域地质背景和有利的成矿条件,成矿远景好,预测钠硝石资源量,已达到中型矿床规模,并可进一步扩大找矿远景。
2.
The paper further points out that the key to the regional geological hazard risk assessment is analyses of the regional geological background, hazard generation regularities and main controlling factors.
进而强调指出:区域地质背景分析、灾害成生规律分析、主控因素分析是区域地质灾害危险性评价的关键。
补充资料：太平洋地区标准会议标准(见太平洋地区标准会议)
太平洋地区标准会议标准(见太平洋地区标准会议)
standards of PASC: see Pacific Area Standards Congress; PASC
Ta iPingyang Diqu Bioozhun Hu呼ib沁幻Zhun太平洋地区标准会议标准(s切md田心sofR巧C)见太平洋地区标准会议。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条