查询词典 crown

Now, a convenient, efficient pinacol coupling of aldehydes mediated by zinc in good yields has been carried out in ammonia water in the presence of a little crown ether. Adding a small amount of crown ether was highly effective to enhance the yields of pinacol from 63% to 84%.

本文报道一种简便、有效的水相呐偶合反应，它是在含有少量冠醚的稀氨水溶液中，使用锌粉促进醛基化合物进行水相呐偶合反应，其中加入少量的冠醚有助于提高反应的产率，呐醇产率由63%提高到84%。

Both the standard 33cl and 25cl FUSION bottles will be produced on the line, with all three closure types, ROPP (re-sealable), MaxiP Crown and Standard Crown, available.

这两个标准的33厘升和25cl瓶融合会产生对符合关闭所有三个类型，罗普，MaxiP皇冠皇冠和标准，可用。

The results were as follows: 1 There were 7 133 trees, belonging to 23 species and 18 genera and 13 families, and their average DBH, crown and height were respectively 27.59 cm, 4.10 m and 6.94 m. In general their average crown was relative small. 2 S, H (Shannon-Wiener index), and D of biodiversity index were small, and there were the obvious difference in those indexes among different streets, which suggested that there were certain monotone of the tree species and structure layer. 3 The dominant species mainly consisted of evergreen trees that were Ficus virens var. sublanveolata, Ficus benjamina, Roystonea regia, Terminalia hainanensis, T.

结果表明：1梅州城区行道树共有13科18属23种7133株，其平均胸径、平均冠幅、平均树高分别为27.59cm，4.10m，6.94m，总体上看，平均冠幅偏小；2物种丰富度指数S、Shannon-Wiener指数H和Simpson指数D偏小且各道路间差异明显，说明各道路行道树存在一定程度的物种单一性、层次的单调性；3梅州市城区行道树优势树种是大叶榕、垂榕、大王椰子，次优势种为海南榄仁、阿珍榄仁、阴香，它们是梅州城市街道绿化的好树种。

Three types of dyes derived from crown ether benzotellurazole (including telluracarbocyanine, polymethine styryl dye and merocyanine dye) are formed by the methods analogous to non-crown ether dyes.

本文系统研究了冠醚苯并碲唑的各种合成方法，探讨了杂环的季铵化反应，并进一步制备了对称冠醚碲碳菁及冠醚苯并碲唑衍生的多甲川苯乙烯菁、部花青染料。

From the appearance characteristics of plant community,the synusia structure of plant community in Minqin desert grassland was composed of simple herbaceous and shrub layer,and individual plants was dwarf,small crown,low biomass,with an average altitude of 0.60 m and lower than 1.00 m~2 crown;except for Nitraria,Zygophyllaceae and Caragana,the fresh weight of per plant biomass of most plant were below 1000 g / individual.

8从植物群落的外貌特征来看，民勤荒漠草地各植物群落的层片结构是由简单的灌木层和草本层组成，且植物个体矮，冠幅小，生物量低，平均高度在0.60m以下，冠幅在1.00m~2以下；生物量除了白刺、泡泡刺和柠条外，大多数植物的单株生物量鲜重都在1000 g/株以下。

There is a coat of arms in the cloak which has a crown on the top and there is a lion wearing a trifoliate crown on the blue coat of arms.

为红色盾徽。盾面上为一只头戴王冠的金色狮子，前爪握着一把剑，后爪踩着一把弯刀。

There are a symbol of the Virgin Box distinguished status of "crown of the Virgin", to wear the crown you can experience in the game Miss World, the super models of the atmosphere of the people upside down, whether ZHANG Zi Lin Zhang is none of your Super popular.

宝盒里有象征圣女尊贵地位的&圣女王冠&，戴上王冠你就可以在游戏里体验一下世界小姐、超级模特颠倒众生的风情了，无论是章子怡还是张梓琳都比不上你的超级人气。

The sources of revenue of the Dynasty mainly included crown lands and private possessions of the Sultans, escheats to the crown and confiscation, tribute and presents, war plunder, normal taxation.

早期伽色尼王朝财政收入的来源包括王室领地和苏丹们的私人财产、无继承人财产和没收的财产、地方统治者或总督进献的贡物和赠送的礼物、掠夺的战利品和税收等五个方面。

In addition, the method of optimizing the surface curves of work roll and backup roll is provided to further improve strip crown and shape quality on the basis of optimal bending force pre-setup, and works out the crown value which the two cases can reach.

结果表明，与仅有弯辊力相比，辊型优化与弯辊配合不仅使成品板凸度大幅度降低，而且也大大降低了各架弯辊力设定值，是一条既经济又先进的热带钢连轧机技术改造之路。

CROWN Food Europe, a subsidiary of Crown Holdings, Inc., announces its extended range of bowl-shaped cans for the single-serve food market in Europe and North America.

皇冠粮食欧洲的子公司皇冠控股有限公司（纽约证券交易所：胆囊收缩素），宣布其广泛的碗，罐形的单一服务粮食市场在欧洲和北美。

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。