根条件

So, a necessary and sufficient condition for the system to be stable is that the roots of the characteristic equation have negative real part.

因此，系统稳定的一个必要充分条件是特性方程的根有负的实部。

The content of reducing sugar and non-reducing sugar in the top of chicory root was low relatively, the content of protein was high.

将菊苣根用0.04mm厚的PE袋包装，在0℃、-2℃条件下可以很好地贮藏150天，且两个温度下的贮藏效果差异较小。

Colgan Air recommends pilots fly manually in icy conditions. Pilots are required to do so in severe ice.

科尔根航空公司建议飞行员在结冰情况下使用手动驾驶并要求他们在严重结冰条件下必须使用手动驾驶。

Colgan Air recommends pilots fly manually in icy conditions.

科尔根航空公司建议飞行员在寒冷的条件下要手动驾驶。

Under certain conditions, the activation and migration of soil Cd were accelerated by the interaction of Pb and Cd and increased Cd uptake by wetland rice. The organic-bound Cd in rizhosphere decreased by 90%. These phenomena illustrates that the interaction is very important for the transformation of soil Cd fractions. Meanwhile, the interaction distinctly affected the composition of roots secretion and their coordination abilities with heavy metals, causing clear variation to Cd amount in root cortex and middle columniation.

在一定的实验条件下，Pb和Cd的交互作用促进了Cd的活化与迁移，增加了水稻地上部分对Cd的吸收，使根际土有机结合态Cd下降了90%左右，表明交互作用对Cd形态的转化是一个重要的控制因素；同时交互作用对根系分泌物的组成及其与重金属的配位能力有着明显的影响，使Pb、Cd在根系皮层和中柱中Cd的含量有明显变化。

In previous study,the ability of plant resist-drought almost focuses on plant foot,corm and leaf,except seed, especially,large number kinds of plant species is not report.

以往的植物抗旱性研究，多集中在植物成株后的根、茎、叶组织等方面，而对种子的抗旱性研究较少，特别是对批量旱生植物种子，在各种水分条件下的响应方式的研究未见报道。

Eleven crown gall strais of peach trees which comes from the peach orchards of Beijing and Zhengzhou are separated from the axenic medium.

以从北京、郑州桃园采集的桃根癌瘤为材料，在无菌条件下于培养基上分离得到11个根癌土壤杆菌菌株。

To determine suitable surface sterilization methods, media and inoculation methods for grape stem and leaf explants and then establish testing methods for the effect of biocontrol Agrobacterium vitis E26 against grape crown gall in vitro.

［目的］筛选葡萄离体茎段和叶片的最适表面消毒条件、离体培养基和接种方法，建立生防菌株E26防治葡萄根癌病效果的离体检测方法。

He was shy, crushingly insecure about women, poor and with limited prospects, not extravagantly endowed physically (he described his penis as 'refined'), yet women were always drawn to him, Bazzana reports.

他害羞，对女性缺乏安全感，贫穷、前途黯淡，生理条件一般（他自己形容他的男根是'优雅的'），然而，女人们总是被是被他吸引。巴札纳写道。

With the growth-promoting bacteria HRO-C48 in plant rhizosphere as tested strains, the growth-promoting effect of chitosan on tomato and the influence of its combination with HRO-C48 on the biocontrol potential of the strain, including its induced resistance effect on grey mould in tomato and its biocontrol effect on damping-off of cucumber were determined in greenhouse.

以植物根际促生细菌HRO-C48为供试菌株，在温室条件下测定壳聚糖对番茄的促生作用以及HRO-C48与壳聚糖组合对该菌株生防潜能的影响，包括对番茄灰霉病的诱导抗病作用、对黄瓜猝倒病的生物防治效果。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。