B. campestris content of leaf chlorophyll, leaf area index , leaf area-weight ratio were positive significantly correlated with the PR.
红菜苔叶片叶绿素含量、叶面积指数及比叶重与群体光合速率成正相关；
The design can realize the corresponding retrieval system, and the experiment also indicates that this system can improve recall ratio and pr...
设计实现了相应的检索系统，实验表明，该系统可以有效地提高检索的查全率与查准率。
The design can realize the corresponding retrieval system, and the experiment also indicates that this system can improve recall ratio and pr...
设计实现了相应的检索系统，实验表明，该系统可以有效地提高检索的查全率与查准率。
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