The BEA's classification does not include headquarters and research facilities, most of which are clustered in the state, according to Donald Grimes, an economist at the University of Michigan.

密歇根大学的经济学家唐纳德·格莱姆斯(Donald Grimes)称，BEA的分类尚不包括总部和研究机构，而它们又大多聚集在密歇根州。

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This classification is of several important value for research, design, production, sale, purchase, management, operation and service of medical facilities.

这种分类，对医疗设备的研究、设计、生产、销售、购置、管理、使用、维修均有意义。

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This paper describes the necessity of taking water from reservoir surface and classification of reservoir surface intake facilities.

本文简述了表层取水的必要性，表层取水设施的分类。

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