Based on and starting from the false-displacement fundamental, this paper puts forward a simple, general and effective method for deriving the pressure Angle expressions of earn mechanisms.
以虚位移原理为理论基础和出发点，提出了一种简单通用、行之有效的推导凸轮机构压力角表达式的新方法。
Starting from the Angle of competency, based on Education Quality Standards for professional degree of MLIS, this paper builds the index system of the MLIS's competency.
从胜任特征的角度出发，以国际上影响较大的图书情报硕士专业学位的教育质量标准为基础，构建图书情报硕士胜任特征指标体系。
Starting from the Angle of the measurement, this paper introduces in detail the measuring method for mercury content in the food.
文章从检测角度入手，详细介绍了食品中汞含量的测定方法。
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