查询词典 null algebra

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

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

In this new architectural plan the Garden of Golgotha came to be at the centre of the new city.

Aelia 是高举他自己，并在此城内朝拜罗马诸神。

The continuous nature of peat accumulation means that terrestrial coaly rocks may provide a higher resolution and more complete record of base-level change than the time-equivalent shallow-marine strata, thus enabling the identification of highfrequency cycles that are not recorded in themarine strata.

泥炭积累的持续性质的手段，陆地coaly岩石可提供较高的分辨率和更完整的记录基准面变化的影响时，相当于浅海阶层，从而使确定的高频周期，不记录在themarine 阶层。