- 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 term null hypothesis arose from earlier agricultural and medical applic ation of statistics .
无效假设这个概念产生于早期的统计学在农业和医学方面的应用中。 - If a set contains no elements we shall designate it by Ф and define it as the empty or null set .
如果一个集合不包含元素，我们就把它记为，且定义它为空集或零集。 - Whenever we reject the null hypothesis, the conclusion we do accept is called the alternative hypothesis .
无论何时，拒绝无效假设时，我们所接受的结论叫做备择假设。 - The null result of the michelson-morley experiment suggests that the effects of the ether are undetectable .
迈克耳孙-莫雷实验的否定结果使人想到，以太的效应是不能检查到的。 - The city manager should accept the null hypothesis that there is no difference between the two methods of tax listing .
市政府官员应该接受两种征税登记方法没有差别这个无效假设。
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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