查询词典 null function

The asymptotic property of the modified supremum-type statistic and the integral-type statistic under the composite null hypothesis are derived.

对上界型检验统计量，研究了与之有关的一个极限性质；对积分型检验统计量，证明了其在复合零假设下的渐近分布。

The binary + operator performs string concatenation when one or both operands are of type string. If an operand of string concatenation is null, an empty string is substituted. Otherwise, any non-string argument is converted to its string representation by invoking the virtual ToString method inherited from type object.

由此可知 C#的加号运算子预设就支援字串串加的功能，只要一群字串串接的物件中只要有一个以上的物件型别是「字串」的话，就会全部变成「字串相加」，只要遇到「非字串」的物件，预设会使用继承至 object 物件的 ToString 方法进行转型，让所有物件都变成「字串」后进行相加动作。

Concha F%Barrientos A%Munoz L A phenomenological model of a hydrocyclone London , 1996,null

刘晓敏%蒋明虎脱油型水力旋流器空气核的稳定性分析石油学报， 2004，6

The null hypothesis is that the efficient estimator is a consistent and efficient estimator of the true parameters.

2， 如果上述理论逻辑通的话，将内生变量 X 作为解释变量， IV 和其他变量（ X2）作为解释变量，看 IV 是否显著，它应该显著。

Santa Regina I%Leonardi S%Rapp M Foliar nutrient dynamics and nutrient-use efficiency in Castanea sativa coppice stands of southern Europe 10.1093/forestry/74.1.1 Forestry , 2001,null

徐福余%王力华%李培芝%许思明%张颂云若干北方落叶树木叶片养分的内外迁移：Ⅰ。浓度和含量的变化应用生态学报， 1997，1

Cowper G R%Symonds P S Strain Hardening and Strain-rate Effects in the Impact Loading of Cantilever Beams Brown Univ Division of Applied Mathematics Report No.28 , 1957,null

封加波 对薄层柱壳爆炸膨胀断裂过程的研究高压物理学报， 1988，(2)章冠人韧性和脆性断裂的分形维数爆炸与冲击， 1996，2

Chen Weimin%Guo Xiaoming Annual change in zooplanktonic crustacea and their relationship with physico-chemical factors in Chonghu Lake International Journal of Ecology and Environmental Sciences , 1987,null

陈伟民%秦伯强太湖梅梁湾冬末春初浮游动物时空变化及其环境意义湖泊科学， 1998，(4)黄祥飞湖泊生态调查观测与分析北京：中国标准出版社， 1999，null

Check to ensure that the current value is not null/Nothing.

检查以确保目前的值不为null /没有。

The next parameter should be null unless you want to use a custom software rasterizer, which is very unlikely.

下一个参数应该是空，除非你想使用自定义的软件光栅，这是非常不可能的。

Dawe R O%Oswald T R%Robson I A Oil Recovery Process Using Mobility Control Fluid Comprising Alkylated Diphenyl Oxide Sulfonates and Foam Forming Amphoteric Suffactants US Pat Appl,US5203411 , 1993,null

张玉芬%乔聪震%张金昌%李成岳离子液体合成长链烷基苯 10.3321/j.issn：1000-8144.2003.10.004 石油化工， 2003，(10)彭朴采油用表面活性剂北京：化学工业出版社， 2003，null

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。