运用多元回归分析法和主成分分析法，讨论了前郭县土地利用变化的社会经济驱动机制。
The paper discuss socioeconomic drive mechanism of land use change in Qianguo County by using the multivariate regression analysis method and the principal component analysis method.
在RX直流电动机驱动器结合垃圾转运站，提供一个机制，对于任何经济的解决方案的应用伺服。
The RX DC motors, combined with RTS drives, provide an economical solution for any servo-mechanism applications.
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