Social Exchang Theory 社会交换理论
Methods: Using DE52 ion exchang method.
方法：应用DE52离子层析法。
The defaults in heat-exchang system for medical oxygen , the improvements and the effect obtained are introduced briefly.
简要介绍了医用氧换热系统存在的缺陷，所采取的改进措施及所取得的效果。
According to stages, we test the stochasticity of Shanghai Stock Exchang in this paper, then make a conclusion that the market is efficient (weakly).
分阶段检验上海股市的随机性，从而得出上海股市有效(弱式)的结论。
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