Cigarettes - determination of nicotine and nicotine - free dry particulate matter in sidestream smoke 卷烟.侧流烟气中焦油和烟碱的测定
The 4 - step ways are as the follows : first , i gave lectures - - introducing the harm to themselves , other people and society of inhaling fumes directly and indirectly . second , in order to strongly impress the students about the harm of smoking , i helped them to determine the poisonous ingredients of the fume in the chemistry lab and get them to see with their own eyes the death of the white mice . third , i intensified their understanding of the harm of smoking by means of " discussion and communication . 这四步无烟教育方法是:第一步,举办知识讲座? ?介绍主流烟雾、侧流烟雾对人对已对社会的危害;第二步,紧紧抓住中学生的心理,充分发挥化学实验室的功能,让学生亲眼看到烟雾毒死小白鼠,亲手操作测定烟雾中的有害成份;第三步,利用“讨论交流”强化学生对烟害的认识;第四步,利用“情景演示”法锻炼、提高学生拒绝烟草的勇气和技巧。
侧: slant; sloping侧流;外溢: effluent侧流槽: lateral channel侧流道: side runner侧流角: crab侧流堰: side flow weir; side-flow weir横流;侧流: cross current侧流;顺向流: alongside current侧流板,隔板: orifice侧流冰水道: lateral channel侧流道泵: ide pump; side channel pump; side pot type piston pump侧流道泵壳: casing with transfer passages侧流道叶轮: vane wheel侧流换热器: side stream heat exchanger侧流汽提器: side stream stripper; side stripper侧流顺向河: lateral consequent stream侧流效应: side-flow effect管侧流体: tube side fluid再会流侧流: anabranch侧流式溢洪道: lateral flow spillway; side channel spillway低压侧流量阀: low side flow valve甲板舷侧流水沟: gutter waterway边界层外侧流线排挤位移: boundary layer displacement侧流道泵壳;旋涡泵泵体: annular casing; casing with transfer passages侧馏分产品: side-stream product侧馏分: offstream; side-cut distillate; side-draw