四对的

The results showed that the soil catalase and dehydrogenase activities, soil microbial biomass N and microbial biomass C were restrain somewhat by four acetanilide herbicides at the beginning of cultivation, but can recover soon.

研究表明，培养初期丁草胺、乙草胺、丙草胺和异丙甲草胺对土壤过氧化氢酶和脱氢酶活性、对土壤微生物量氮和微生物量碳有不同程度的抑制，但均能很快恢复，四种供试酰胺类除草剂对土壤生态的影响不大，除草剂之间也没有表现出显著差异；培养初期rac-异丙甲草胺和S-isomer高浓度处理均比常规用药量处理对土壤酶、土壤BN和Bc的影响大。

The second part compares the consonants of the four kinds of dialects in details, studies some ancient characteristics of their consonants systems, for example, light labial read as heavy labial、知组 read as 端组,心生书禅邪 read as affricate,匣母 read as

第二章对四种方言的声母进行了较详细的比较，探讨了四种方言声母系统中保留的一些古老的语音特点，如轻唇读如重唇、知组读如端组、心生书禅邪读塞擦音、匣母读零声母等

We studied effects of additives in the allylic amination reaction. We found that4NF could improve the reactivity and enantioselectivity.

对于烯丙基胺化反应，我们研究了外加添加剂对对映选择性的影响，我们发现四丁基氟化铵的加入可以大大提高反应速度及对映选择性。

Anethole accounted for 82.65% of the whole oil. Selective isolation of anethole form the volatile oil was carried out using an inclusion crystalline method with 1,1,6,6- tetraphenylhexa- 2,4-diyne-1,6-diol inclusion complex with anethole . The crystal structure of the inclusion complex was determined by IR, 1^H NMR and single crystal XRD techniques.

采用包结结晶方法对小茴香挥发油中的对-丙烯基茴醚进行了选择性分离，以1，1，6，6-四苯基-2，4-已二炔-1，6-二醇作为主体分子，小茴香挥发油中的对-丙烯基茴香醚作为客体分子，D.D选择性地与之形成超分子包结物晶体。

Anisaldehyde was synthesized from p-hydroxybenzaldehyde with dimethyl carbonate by microwave irradiation under phase transfer catalyst tetrabutylammonium bromide, The effect of power, time, solvent and catalyst of reaction on yield were researched.

以四丁基溴化铵为相转移催化剂，采用对羟基苯甲醛和碳酸二甲酯为原料，微波辐射下合成大茴香醛。考察了反应溶剂、功率、时间和催化剂对反应产率的影响。

After analysing the existing smooth orientation interpolation methods we proposed a smooth orientaion interpolation method based on cubic cardinal spline in quaternion space. This method possesses the following advantages: interpolation, C〓 continuity, accurate evaluation of the quaternion value at arbitrary parameter, transparent to the users, adjustable parameters for controlling the velocity of orientation change.

在分析现有的朝向光滑插值方法基础上，提出了基于四元数空间三次C样条的朝向光滑插值方法，该方法具有插值、C〓连续、任一参数处的四元数值可精确求得、对用户透明、可以用参数调节关键帧处物体朝向变化的速度等优点。

In the crosses of the autotetraploidy rices used as the females, some seeds could be got, but more seeds were obtained in these crosses by the special treatment that the DH solution was put into the caryopses before the pollination.

在以同源四倍体水稻为杂交母本的杂交组合中，可以获得一些实粒种子，但是，如果在授粉前利用DH溶液对同源四倍体水稻的去雄颖花进行处理后再授狼尾草的花粉粒则能获得更多的实粒种子。

This paper is using S Company, which is developing and manufacturing a cell phone key bottom, as the research base. This research is also using hyper links and surveying auxiliary patterns as variable factors to create four kinds of web site frameworks. Furthermore we are taking different background staff, a development team, a non-development team (Sales, Quality and Production department) and new employees to run an experiment to analyze and estimate the efficiency of four kinds of design based web site frameworks.

本研究以专司手机按键研发与制造的S公司作为研究背景，将超连结的视窗与导览辅助模式做为研发知识分享资讯网的可变因子，创造出四种不同的知识网页架构，并藉由搜寻任务来了解研发人员、非研发人员、和新进人员对於此四种实验网页的操作效益和评价。

The genome DNA was extracted from the red blood cells or blood of the infected sheep and goats which include as isolates of ovine Babesia from these different geographic areas. The gene specific primers were devised according to the pubulished 18srRNA sequence at GenBank. The target DNA segment was amplified by polymerase chain reaction, the PCR product was ligated into PGEM-Teasy vector.

用分离于四个地区的羊的巴贝斯虫感染实验动物，自感染羊的红细胞或全血中提取基因组DNA，根据GenBank中已发表的巴贝斯虫18S rRNA序列设计两对羊巴贝斯虫特异性引物，通过PCR扩增目的基因片段，将扩增产物连接到PGEM-Teasy载体中，经酶切鉴定，PCR分析，进行序列测定，结果显示羊巴贝斯虫四个分离株的18S rRNA基因大小为1800bp左右。

The results indicate that potassium borate possesses very excellent extreme pressure and good antiwear capacities in water.

结果表明，四硼酸钾对提高水的极压性能效果十分突出，对改善抗磨性能效果一般。

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。