null-set 零集
l null set l 零集
locally null set 局部零集
function-theoretic null-set 函数论的零集
SET NULL 设空值 ; 设置为空 ; 置空方式 ; 将外键设置为空
null data set [计] 空数据组 ; 空数据集
null set of class nf NF类零集
function theoretic null set 函数论的零集
function theoretic null-set [数] 函数论的零集
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The relation between threshold, weight and matching degree is also discussed. In order to make the querying friendlier, the method to avoid returning null set and corpora is also presented.
研究了权重、阈值和匹配度之间的关系，提出了避免查询结果为空集或全集的方法，使得查询更加人性化。
If the form input field is not null, set the payload you receive as the widget value, as shown in Listing 14.
如果表单输入字段不为空，将小部件的值设为接收到的负载，如清单14所示。
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