查询词典 null

Acosta-Martínez V%Tabatatai M A Enzyme activities in a limed agricultural soil 10.1007/s003740050628 Biology and Fertility of Soils , 2000,null

和文祥%蒋新%卞永荣%王芳杀虫双对土壤酶活性影响的研究西北农林科技大学学报， 2002，1

Del Castilho P%Chardon W J%Salomons W Influence of cattle manure slurry application on the solubility of cadmium,copper and zinc in a manured acidic,loamy-sand soil Environment Quality , 1993,null

郑春荣%陈怀满土壤-水稻体系中污染重金属的迁移及其对水稻的影响环境科学学报， 1990，(2)郑春荣复合污染对水稻生长的影响土壤， 1989，1

In most cases, its redundant to have two possible values for no data; Djangos convention is to use the empty string, not ''NULL'' .

而大多数情况下，空数据没必要对应两种可能的值，所以Django中习惯使用空字符串，而不是 ''NULL'' 。

Null Effect of organic mulches and plastic sheet on soil temperature Deciduous Fruit Grower , 1991,4

徐长金%张立峰冀西北高原农牧业持续稳产技术途径北京：中国农业科技出版社， 1993，null

Background— Protein kinase A signaling has long been known to play an important role in cardiac function. Dysregulation of the protein kinase A system, caused by mutation of the protein kinase A regulatory subunit gene PRKAR1A, causes the inherited tumor syndrome Carney complex, which includes cardiac myxomas as one of its cardinal features. Mouse models of this genetic defect have been unsatisfactory because homozygote null animals die early in development and heterozygotes do not exhibit a cardiac phenotype.

背景——蛋白激酶A信号传导在心功能中发挥了重要作用早已为人们所知蛋白激酶A调节亚基因PRKAR1A的变化引起蛋白激酶A系统失调，导致了遗传性卡尼复合肿瘤综合症，其中包括的心脏粘液瘤作为它的一个主要特征此种遗传缺陷的小鼠模式仍然不能令人满意，因其纯合体空白动物在发展中早期死亡，而杂合体不能显示心脏表型

Null China would win. We wouldn't use nukes and they have more people

中国会赢，我们不会使用核武器而他们有更多的人。

Watanabe A%Machida N%Takahashi K%Kitamura S Kimura M Flow of photosynthesized carbon from rice plants into the paddy soil ecosystem at different stages of rice growth Plant and Soil , 2004,null

杨建昌%徐国伟%王志琴%陈新红%朱庆森旱种水稻结实期茎中碳同化物的运转及其生理机制 10.3321/j.issn：0496-3490 。2004.02.004 作物学报， 2004，02

Rather, all my skill and time working the ball up field,are null and void because the opponent "clears" the ball by ping ponging.

如果不是这样的话，我的所有技术都是徒劳的，因为对手可能通过pingpang的方式清楚地传递。

Rescinded civil acts shall be null and void from the very beginning.

被撤销的民事行为从行为开始起无效。

Rescinded civil acts shall be null and void from the very beginning.

二显失公平的。被撤销的民事行为从行为开始起无效。

No, it's unnecessary. I don't think I have a fever.

不，没有必要，我想我没有发烧。

We live in a culture of instant gratification.

我们生活在即时满足的文化中。