- adj.
1.无效力的，无束缚力的。
2.无效的，无用的，无益的；无价值的。
3.没特征[个性]的，没表情的。
4.〔罕用语〕不存在的，没有的；零(位)的；空的。n.
【数学】零，零位；空；【无线电】零讯号，微弱讯号。 a null indicator 零示器；零位指示器。 the null method 衡消法。 null and void 【律】无效；失效(This check is null and void. 本支票无效)。vt.
使无效。
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null中文什么意思
例句与用法
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- The null result was directly related to a central postulate of the theory .
零结果都直接与理论的中心假设相联系。 - The device provides extreme sensitivity through a small range around the null point .
此装置在零点附近很小一段范围内具有极高的灵敏度。 - The zero or null matrix denoted by 0 is definde as a matrix all of whose elements are zero .
如果一个矩阵的所有元素都为零，则称它为零矩阵。 - A null output should occur when the core is at the center point between the two secondary coils .
当磁心位于两个次级线圈之间的中点时，没有输出。 - As a result, the denominator and numerator should be about equal if the null hypothesis is true .
因此，如果无效假设为真，那么分母和分子应该差不多相等。
英文释义
名词- a quantity of no importance; "it looked like nothing I had ever seen before"; "reduced to nil all the work we had done"; "we racked up a pathetic goose egg"; "it was all for naught"; "I didn''t hear zilch about it"
同义词：nothing, nil, nix, nada, aught, cipher, cypher, goose egg, naught, zero, zilch, zip, zippo
- lacking any legal or binding force; "null and void"
同义词：void
百科释义
NULL本意是“空的；元素只有零的”意思牛津词典编译出版委员会／著；曹书乐／译；《新牛津英汉双解大词典》[Ｍ]．上海外语教育出版社．
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