向量空间模型的基本思 想是使用词袋法（bag-of-word）表示文本，每个特征项对应特征空间的一维，文 本D可用以下形式描述为D＝（wl，Wl，W2，W2，…，Wi，Wi，…
基于8个网页-相关网页
植苗袋法栽植山杏试验，是半干旱地区造林新技术研究的主要内容。
Cultivating experiment of Prunus armeniaca by using pocket-transplanting method is one of the investigation contents about new forestation techniques in semi-arid area.
采用根际袋法研究了稀土在春小麦根际土壤与非根际土壤中存在形态的差别。
Existent state variation of rare earth elements (REEs) in wheat rhizosphere and non-rhizosphere soils were studied using root - box technique.
用室内恒温控湿培养法和埋袋法研究了不同时间序列下黑土有机磷的矿化过程。
Buried bag and incubation experiments were conducted to study mineralization process of organic phosphorus in black soil in Northeast China under different time sequences.
应用推荐