This paper mainly designs a kind of velocity collection system of the excavators which is ordered by Caterpillar Company. A new method in measuring the velocity is advanced, based on the pendulum.

本文主要设计了卡特彼勒公司定制的挖掘机空调的风速流量采集系统，提出了一种基于单摆法的流量测量方法，该方法的原理是基于流体阻力式的。

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The Detroit News and Detroit Free Press both reported Friday that GM is moving the engineers -- who have been working on the fuel-cell technology in the company's advanced development laboratories division -- to the company's core production engineering division, which designs vehicles to be brought into production.

CNN: GM takes step toward fuel-cell car