The character signals of an internal combustion engine in operation were extracted by choosing appropriate sensor, improving the mounting method for the sensor and selecting test point reasonably.
主要叙述在内燃机不停机的情况下，通过选择恰当的传感器，改进传感器的安装方法和合理选择测点来提取机器特征信号。
Purchasing control is a strategy approach to Internal control of modern enterprise, The article study the point, of it the correlated procedure and method of Purchasing control.
采购控制是现代企业内部控制的重要环节，文章探讨了企业采购控制的重点及相应的程序与方法。
The elastic and plastic problem of thin-walled curved box girders is solved with the spline finite point method and the section internal force plastics coefficient method.
采用样条有限点法和截面内力塑性系数法对薄壁曲线箱梁的弹塑性问题进行了求解。
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