饮用水中痕量有机污染物分析用试剂二氯甲烷的纯化用浓硫酸洗至酸层无色后,以全玻璃仪器蒸馏三次,浓缩50～100倍经气相色谱检查无干......

报道一种新型便携式横向激励大气压CO2激光器。该激光器采用4节5号充电电池直流供电，在1Hz重复频率条件下，可连续工作1h。激光器整机......

An accurate chlorine bulk decay model is needed to ensure that potable water meets the microbial and the chemical safeti......