查询词典 null function

Other than the difference with default values for optional arguments, you should assign a default when a passed argument has a null value.

和PHP不同的是可选参数，你需要比较它是否是空的，再赋给它一个默认值。

Fan Delian Metal Enrichment-Layer in Lower Cambrian Black Rock in South China. Study on Sediment and Petrology 北京:科学出版社, 1981,null

范德廉 南方几省下寒武统黑色岩系及层状多金属富集层北京：科学出版社， 1981，null

It can be used in SDTV or HDTV stream multiplex in real time. Furthermore the technology of CBR multi-program multiplexing is researched. It presents inserting the PSI information and designwith the input and output buffer. It proposes the methods of using reconstructed the null packet to recover the PCR information when demultiplex and by utilizing modification PCR to remove the dithering of PCR when multi-program multiplex processing.

研究了基于CBR方式的多节目复用技术，给出了多节目复用PSI信息的维护和输入输出Buffer的设计，提出了采用空包重建的方式将多节目TS流解复用为单一的携有原有PCR信息的TS流以及利用PCR修正实现多节目复用PCR抖动的校正，并对帧平移法统计复用进行了研究，给出了仿真结果及性能。

Schweingruber F H Tree ring,basics and applications of dendrochronology Dordrecht:D.Reidel Publishing Company , 1988,null

吴祥定%邵雪梅中国秦岭地区树木年轮密度对气候响应的初步分析应用气象学报， 1994，2

If an object does not want to be deleted, its destructor would return a null pointer.

如果一个对象没有要被删除，他的析构器将返回一个空指针。

I have moved a file to /dev/null and now my system doesn't work.

我曾经将一个文件移动到/dev/null目录下，然后我的系统就不工作了。

This paper devoted to the initial boundary problem of a degenerate reaction system with the null Dirichlet boundary condition.

研究一类具有Dirichlet边界条件的非局部退化反应扩散系统的初边值问题。

The main problem studied in this thesis are properties of positive solutions to a semi-linear parabolic system with non-local nonlinear sources and null Dirichlet boundary conditions.

中文摘要：本论文主要研究了具有非局部源的半线性抛物系统并附加Dirichlet零边值的解的性质，得到了系统古典解的渐近性分析：blow-up速率、blow-up集、边界层估计等问题。

The main problem studied in this thesis are properties of positive solutions to a semi-linear parabolic system with non-local nonlinear sources and null Dirichlet boundary conditions. We give the analysis about asymptotic property: blow-up rate, blow-up set and blow-up profiles.

本论文主要研究了具有非局部源的半线性抛物系统并附加Dirichlet零边值的解的性质，得到了系统古典解的渐近性分析：blow-up速率、blow-up集，边界层估计等问题。

It is shown that The asymptotic null distribution of the modified likelihood ratio test proposed is derived and found to be relatively simple and easily applied.

最新的文献表明这个提出的修正似然比检验统计量在零假设下的渐近分布是比较简单，并且是容易应用的。

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。