reference sources for the calibration of surface contamination monitors-beta-emitters and alpha-emitters 用于校准表面污染监测仪的参考源发射体和发射体
reference source to companies and organizations in the oil, gas, water, wastewater, and associated pipeline industries worldwide -收录适合拍卖摆摊或开店买卖创业的批发商名录,并提供批发商品图录线上查询
directory of sites covering american, ancient, world and modern history, social studies, reference sources, study tips and related resources -专栏包括学术信息理论与史学史海外中国学史评论,以及有关的学术访问记交流
make notes from the sources, and make sure you reference sources as you go along, as this saves time and difficulties later on 给资料注上标记,在工作进行的过程中,保证那些资料就在你身边,这样能节省你的时间,并且减少之后查找的难度。
reference sources for the calibration of surface contamination monitors part 2 : electrons of energy less than 0.15mev and photons of energy less than 1.5mev 用于校准表面污染监测仪的参考源第二部分:能量低于0.15mev的电子和能量低于1.5mev的光子