[摘要]本研究对622名中职学生进行问卷调查,发现中职学生校园越轨行为具有普遍性、差异性和特殊性的特点。在分析调查结果的基础上对中职学校教育提出了建议与对策。 [关键词]中职学生 越轨行为 一、研究方法和研究对象 本文主要采取了问卷调查法,对郑州地区的4所中职学校共计622名学生进行调查。共发放问卷622份,回收有效问卷609份,有效率95.7%。其中城市学生303人,乡镇学生306
Water, oxygen and coal are converted into CO, H2, methane in the coal slurry gasifier. Under the condition of high temperature and high pressure, high chromecon
The diagrams of stability relations(namely,Predominance area phase diagram,PAPD)of nitride,carbide and oxides in Ti-C-N-O system were plotted by thermodynamic c
This paper summarizes the pollution, situation and solutions of chrome bearing materials used in high temperature industry. Hexavalent chromium compounds are re
研究表明,小麦秸秆覆盖对杂草数量和夏玉米产量有明显影响。与传统处理相比,常量小麦秸秆覆盖可减少25.5%的杂草数量而加倍的覆盖可以减少杂草数量62.4%。小麦秸秆常量覆盖和加倍覆
One of characteristics of Cr2O3-containing refractory is excellent corrosion resistance. However, there is a problem of hexavalent chromium, which is noxious to