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为了向七年级学生介绍气体的溶解度,A.A.赫鲁斯塔耶夫(布古鲁斯朗市)建议“利用二氧化氮气体,因为这个褐色的气体易溶于冷水。为了演示实验,要用如右图的简单仪器,在试管中注入3—4ml浓硝酸并向其中投入2—3克铜屑。为使反应不致太猛烈,可用少量的水来稀释硝酸。生成的褐色的二氧化氮气体沿着橡 相似文献
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The China Gravity Basic Net 1985 (CGBN85) which comprises 57 gravity stations, including 6 absolute gravity stations, was measured with LaCoste & Romberg gravimeter model G (LCR-G). Precise relative connections were also made between CGBN85 and several existing international standards. A whole adjustment was made by applying the parameter adjustment method, taking scale functions for each LCR-G meter into account. The nationwide new CGBN85 with an average internal accuracy ±8μGal [10~(-8)ms~(-2)] was then established and has been used, since its official appraisal, in gravimetric practices for two years. This shows that CGBN85 meets the requirements of modern earth sciences. 相似文献