leakage protective system

dc examination and selective leakage protective system in underground lv distribution network

井下低压电网直流检测式选择性漏电保护

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There are huge significances for rational exploitation of the biotic population in ecosystem, some extensive and intensive studies are done by many scholars.

生态系统中，生物种群的合理开发意义重大，许多学者进行了广泛而深入的研究。

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The Probing of Biotic Population Regulation Mode

生物种群调节方式探讨

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The seasonal ecological features of phytoplankton community including its species composition, population size, dominant species, saprobic indicator, diversity index and diatom biotic index were preliminarily studied at 22 sampling stations in the Chaohu Lake, Anhui Province.

对巢湖浮游植物在22个样点，四季采样，进行了种类组成、种群数量、优势种、污染指示种，多样性指数及硅藻指数等群落生态学的初步研究。

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model of biotic population dynamics

生物种群动态模型

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