The vegetation cover and management factor ( C ) in the universal soil loss equation (USLE) is an index to evaluate this effect, which has been studied deeply and used widely.
通用土壤流失方程（USLE）中的植被覆盖与田间管理因子（C）是评价这种抑制作用的有效指标，并被广泛采用和深入研究。
A universal design scheme of automatic open-and-close mechanism for front cover of autonomously developed streamlined train head is proposed.
提出了目前我国自行研制的流线型列车头部端盖自动开闭机构通用设计方案。
A universal design scheme of automatic open-and-close mechanism for front cover of autonomously developed streamlined train head is proposed.
提出了目前我国自行研制的流线型列车头部端盖自动开闭机构通用设计方案。
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