引入

At that time, however, nonlinear differential equations had no universal solutions and some problems of celestial mechanics were still required to be resolved.

而非线性微分方程没有普遍解法以及一些天体力学问题的未决，促使庞加莱在微分方程求解过程中引入定性思想，创立了常微分方程实域定性理论这一新分支，突破了原有的微分方程求解的思维束缚，是微分方程研究历史上的一次重大飞跃。

It was shown,based on the study,that cellobiose utility capability of the recombinants was increased,glycerol productivity of that was decreased,and the bglⅡ gene expression was stable in t.

结果表明，整合子利用纤维二糖的能力得到提高，产甘油能力下降，外源基因表达稳定；引入外源基因后，其对酵母增殖能力没有大的影响，仅形态发生变化；在以微晶纤维素为原料，结合纤维素酶发酵时，与亲代工业酿酒酵母相比，发酵液乙醇浓度最高增加69%。

Based on the Criterion of the design of fire alarm system, this paper involves the theory and realization of the Centralize Fire Alarm System.

根据国内外消防报警系统的发展趋势，结合项目的实际需求，在分控中心引入Lonworks现场总线技术。

The addition of cerium can inhibit the formation of spinel phase and make the CuO disperse well.

但铈的引入会使氧化铜分散度增大，同时抑制尖晶石相的生成。

Therefore, based on the study, we put effort level into the basic model, and we study the optimization problem of retailer, supplier, as well as supply chain decision-making on the condition of considering the marketdemand and effort level.

因此，在基本模型研究基础上，将努力水平引入契约模型，考察在产品市场需求与努力水平相关情况下，销售商、供应商，以及供应链的决策优化问题。5。

With the deepening of hydrophobic modification,the dispensability of modified starch in organic solvent liquid paraffin is markedly enhanced. The particle shape changes from rarefaction to cluster grape ball agglomeration state. The long chain group of methoxyl silane coupling agents KH570 is linked with the anhydrous glucose units of the cross-linked starch.

随着疏水化改性程度的加深，改性淀粉在液体石蜡有机介质中的分散性明显增强；颗粒形态由疏松态向串状葡萄球团聚态转变；在交联淀粉脱水葡萄糖单元羟基上引入了甲氧基硅烷偶联剂KH570的长链基团。

It is shown that a continuous flow with the AASP is chain transitive and some equivalent conditions of the continuous flow with the AASP to be chain recurrent are obtained.

对连续流引入渐近平均跟踪性质概念，证明具有渐近平均跟踪性质的连续流是链传递的，同时对具有渐近平均跟踪性质的连续流给出链回归的几个等价条件。

Novel sulfonic acid and carbon chains of mixed-mode packing materials were synthesized through sulfonating polymer-encapsulated zirconia covered by a porous copolymer of olefinic hydrocarbon and divinylbenzene on its surface.

通过共聚交联方法将长链碳烯-苯乙烯包覆到锆胶表面上，得到聚合物包覆固定相，再对该填料进行磺化引入离子官能团到聚合物表面，得到混合型固定相。

In this paper,link transmission modelwas applied to simulate traffic flow under various traffic demands,by which we can investigate the influence of the length of channelization area on the performance of traffic flow.

引入路段传输模型用于模拟不同的交通需求条件下道路渠化区的长度对交通流的影响。

In the construction of the flood control projects, it is necessary to give attention to the ecological requirements by reasonably adopting the technologies of the ecological engineering in order to alleviate the negative effects from the hydraulic projects and avoid both the channelization and the discontinuities of the natural rivers.

在防洪工程建设中，需要兼顾生态需求，合理引入生态工程技术，减轻水利工程对河流生态系统的负面影响，避免自然河流的人工渠道化和非连续化。很多发达国家的堤防工程规范中已明确提出了这方面的要求，并发布了有关的技术导则或手册。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。