本底

• The sources , background value , environmental geochemistry features of fluorine , and its biological effects on animals , plants and human beings were reviewed
  阐述了环境中氟污染的来源、本底值和氟的主要环境地球化学特征及氟对植物、动物和人机体的生物效应。
• Chapter6 positive study on jintan county this part makes a case study of jintan county , and draws the conclusion about the dynamics of cultivated land quality in this county
  其中，耕地本底质量、经济质量与耕地质量发展总趋势吻合，而耕地健康质量有所下降，值得引起注意。
• Chapter2 summarization of dynamic transformation of cultivated land quality firstly , the basic conceptions are given , such as cultivated land and its quality
  第二章耕地质量动态变化概述首先界定了耕地和耕地质量的基本概念，将耕地质量定义为本底质量、经济质量和健康质量。
• The experiment system for studying the interaction of high intensity ultrashort pulse laser with solid targets , the facilities and methods for measuring ultrafast hard x - ray have been built
  首先建立了用于测量激光等离子体产生的超快硬x射线的、基于低本底hpge谱仪的单光子测量方法和设备。
• 1 liu shuzheng . stimulatory effect of low dose radiation on immunity . abstracts of the 4th international conference on high levels of natural radiation , beijing , china , october 1996 , 8
  2陈识杰，姜雅梅，于河有，等.广东高本底地区居民血清免疫球蛋白含量的测定.中华放射医学与防护杂志， 1982 ， 2 ： 68
• In the engineering simulation experiment , the distance between the neutron source and the detector is close , the scattered neutron cannot directly measured through shielding from neutron source with shield cone
  在工程模拟实验中，中子源与探测器相距较近，不能用阴影屏蔽锥法直接测量散射中子本底(即非期望中子) 。
• Based on two investigations into phytoseiid mites in guangzhou region during 2006 , the result showed that 28 species occurred , which belong to 5 genera , and euseius nicholsi ( ehara et lee ) was the predominant species , which makes up 45 % of total samples
  摘要2006年，经2次本底资源调查共得到广州市植绥螨科5属28种，其中尼氏真绥螨是优势种，占采集标本总数的45 % 。