The important reason of causing our country source of water supplying insufficient and national water environment pollution in some area is low water efficiency and large sewage emission.
造成我国部分地区水源供给不足和全国水环境普遍污染的重要原因是用水效率低和污水排放量大。
Repeatability and reproducibility of carbon in low-alloy steel analyzed by spark source atomic emission spectrometry are studied.
研究了火花源原子发射光谱仪分析低合金钢中碳的重复性和再现性。
A facility has been developed that can function as a low-energy electron point source (LEEPS) microscope or a field-emission microscope (FEM).
研制了一台集低能电子点源显微镜和场发射显微镜于一体的设备。
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