复合曲梁中剪应力和径向应力的显式解

在复合曲梁正应力公式的基础上，进一步导出了其剪应力和径向应力的计算公式，从而使复合曲梁的应力问题全部得到解决．作为特例，也可以从上述公式得到该梁在具有纵向对称面，且载荷作用在该平面内时的相应公式．最后给出了计算实例．     

计算机产业贸易保护测度及"入世"后的政策选择

我国计算机产业过去主要依靠关税保护和实施"进口替代" 战略而得以发展,经过初步计算,目前关税有效保护率仍高达13.89%。由于我国计算机产业尚处于产业成长初期,"入世"后,应加强对非关税贸易壁垒和技术引进效率的研究,以促进我国民族计算机产业在竞争激烈的国际市场上健康、迅速地发展壮大。,The development of Chinese computer indust ry was benefit from trade protection and "import substitution" strategy in the past. In the paper, several methods to measure the trade protection degree are provided. And the present effective protection degree of computer industury is c alculated to be 13.89%. The result shows that it is necessary to take some prote cting measures to accelerate computer industry growing in the international mark et.