An elaborate delineation was made about the developmental history of potentialmeasuring device before the 20 th century.

对20世纪以前电位差计的发展史做了详细的阐述,基本可以建立起电位差计发展的真实次序.

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The developmental history and present condition of chemical fertilizer industry in Guangzhou were reviewed.

综述了广州市化肥工业发展的历史、现状的概况,为今后发展化肥工业提供参考.

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The article focus on developmental history and stages of distance education in library science in China.

本文论述了我国图书馆学远程教育的历史发展和分期.

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