Within the study area , Baihe Forestry Bureau land was classified into a two - hierarchy system.

在数字化区划的森林经营类型中, 二级系统被采纳.

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According to this hierarchy system , the distribution law of farmland desertification in Zhangwu County was stu.

并以此初步探讨了彰武地区农田沙化的分布规律.

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The hierarchy system can effectively improve the reliability of power supply and facilitate power network dispatching.

采用分层控制系统,可以有效地提高电力系统的供电可靠性,使电网调度工作更为省力.

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