查询词典 Stu

The present work was de-signed to study systematically the changes of anther and pollen during themannitol pretreatment period on physiology and biochemistry;and then the ef-fects of mannnitol pretreatment on androgenesis and anther culture were stu-died.The donor plants used in this experiment grow in the field.

所以本文从以上几个问题出发，以大田生长的植株作为供试材料，首次系统地研究了甘露醇预处理过程中大麦花药花粉在生理生化方面所发生的变化；以及甘露醇预处理后对大麦雄核发育和培养效果的影响。

StU s%fIrd Abstract: Objective: To explore the optimal nursing method to apheresis platelet donors in order to assure the safety of platelet donors and the product quality of platelet, promote the recruitment and retaining of volunteer blood donors, meet with the need of clinical requirement, and assure the apheresis platelets were 100 percent from volunteer blood donors.

目的：探讨对无偿机采血小板献血者的最佳护理方法，以保证献血者的安全和血小板产品质量，促进无偿献血者的招募和保留，满足临床需要，保证我市机采血小板100％来自无偿捐献者。

In comprehensive utilization of bittern ,it is an important issue to stu dy and develop the magnesium resources in it.

如何更快地研究和开发苦卤中的镁资源，是苦卤化学资源综合利用中的一个重大问题。

Methods Seventy-five stu-dents were recruited based on cluster sampling for this study.

目的 探讨健康教育对护理本科生艾滋病知识和态度的影响。

It was rev ealed that:cuprite,malachite and tenorite are the three main kinds of copper-bea ring minerals which would be supersaturated when Cu concentration in the solutio n is high enough(higher than 0.0016 mol/L,0.0079 mol/L separately) under the stu dy conditions.Copper exists in the solution mainly as the species of CuCO3 ,Cu2+ and CuOH+.The corresponding content of CuCO3 would be decrea sed following the deposition of the copper-bearing minerals,nevertheless,Cu2 + and CuOH+ would be increased.

模拟结果表明，在土壤中常见的E h和pH及研究区的年平均温度条件下，溶液中铜离子的含量达到一定的浓度时，可以生成赤铜矿(当Cu≈00016 mol/L)、孔雀石及黑铜矿(当Cu≈0 0079mol/L)等次生矿物，溶液中Cu的存在形式也发生了变化，即CuCO3所占的比例不断减小，而Cu2+和CuO H+的含量则相继增高，且Cu2+的增幅大于CuOH+。

In addition, an introduction was made to the development of a new decomposable chelating agent, EDDS, and in the last part some existing problems were discussed and foci of the future stu...

本文综合介绍了近年来EDTA等多种螯合剂在植物修复重金属污染土壤中的应用，同时介绍了一种新型易降解的螯合剂EDDS的研究进展，最后对存在的问题进行了讨论，并对未来的研究重点进行了展望。

When it comes to education, the majority of people believe that education is a lifetime stu dy.

说到教育，大部分人认为其是一个终生的学习。

We d better develop our interest in English at the beginning of our stu dy.

在英语学习之初，我们应该注重培养对英语学习的兴趣。

Furthermore,because the interior and exterior characters of fora-miniferal apertures are becoming more and more important in the classification of foraminifera,we should pay more attention to the free specimen s from Paleozoic foraminiferal stu.

另外由于口孔的内部和外部特征在分类学中的地位越来越重要，所以通过实体化石来研究古生代有孔虫理应受到更多的重视。

E-Learning spread the new-type studying form with g reat space; it helps learners to obtain a way of knowledge with modern communica tion technology, computer network technology and multimedia technology. E-Learni ng is a kind of powerful way for the students to finish knowledge studying by th e study platform, the mode make students have much elastic space to choose what they want to study, it has changed the traditional studying way, and it is a kin d of important means of modern study, and form this stu...

E-Learning是传播空间极大的新型的学习形式，它以现代通信技术、计算机网络技术以及多媒体技术来帮助学习者获取知识的一种方式，E-Learning是学生通过学习平台完成知识学习强大途径，这种模式使学生有更大的弹性空间来选择学习，它改变了传统的学习方式，是现代学习的一种重要手段，并且与课堂学习一同构成多元学习手段，也是未来教育的发展方向。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。