查询词典 ring

It has very significant sense for cultivating forests to research the variation regulation of wood ring density quantificationally and then to get to the relation between the basic density and the anatomical characteristic of tracheid.

定量地研究年轮密度变异规律，得到基本密度与管胞形态特征间的关系，对工业材良种选育及用林材的培育具有重要的指导意义。

Eight provenances of 19-year-old Picea koraiensis Nakai from the provenance trials of Maoershan (45°20'N, 127°30'E), Liangshui (47°10'N, 128°53'E) and Jiagedaqi (50°24'N, 124°07'E) in Northeast China were investigated to analyze the genetic variation in growth characteristics and wood characteristics (tracheid length, tracheid diameter, tracheid wall thickness, annual ring width as well as wood density).

以来自中国东北地区帽儿山(45°20'N， 127°30'E)、凉水(47°10'N， 128°53'E)和加格达奇(50°24'N， 124°07'E)的19年生红皮云杉种源试验林8个种源为材料，测定和分析了种源间高生长、径生长和材质性状(管胞长度、管胞直径、年轮宽度和木材密度)的遗传变异。

The main lithologic characteristic is that the rock types are dominated by light-colored clastic rocks reflecting the oxidation environment with a low maturity. The grain size distribution and sedimentary structure show that the rocks have the sedimentary characters of both gravity currents and tractional currents. Plant fragments are lacking and bioturbation structures are abundant and cyclic. Sandbodies are distributed in a ring shape.

其主要岩性特征为：岩石类型以反映氧化环境的浅色碎屑岩类为主，成熟度较低，粒度分布和沉积构造反映其兼有重力流和牵引流的沉积特点，植物碎屑贫乏而生物扰动构造丰富且具周期性，砂体呈环带状分布。

Total synthesis of CET was accomplished by two routes through a conceptually novel strategy featuring a transannular reductive rearrangement as the key transformation for the construction of the core pentacyclic ring skeleton of CET.

我们采用了全新的合成策略，以氮原子参与的跨环还原重排为关键反应，通过两条路线分别成功地合成了三尖杉碱。

In the operation for inguinal hernia in children,ligating hernial sac in high site,shrinking abdominal inguinal ring and repairing transversalis fascia were essential for the prevention of recurrence.

小儿腹股沟疝手术，一定要做到高位结扎，内环大者给予缩小，腹横筋膜薄弱者应给予修补，以达疗效可靠、防止复发的目的。

Ron Mersman, Larry Williams, Earl Ball, Paul Krueger, Doris Ring and Rod Trant.

罗恩Mersman ，拉里威廉姆斯，厄尔球，保罗克鲁格，多环和罗德Trant 。

The successful synthesis of the aromatic triamine containing pyridine ring laid an important foundation for preparation of a novel hyperbranched polyimide.

这种新型含吡啶环芳香三胺单体的成功合成将为一类新型超支化聚酰亚胺的制备奠定重要的基础。

A novel BB'2-type aromatic triamine containing pyridine ring was successfully synthesized by catalytic reduction of the trinitro compound obtained by a modified Chichibabin reaction in acidic medium with hydrazine hydrate.

采用商品化的原料，在酸性介质中经改进的Chichibabin反应先合成含吡啶环的三硝基化合物，再用水合肼催化还原得到一种新型的含吡啶环BB'2型芳香三胺单体。

The structure of ArsA ATPase with its ligand, arsenite, either on membranes or in solution, was revealed. The current trimeric ring-like structure of this protein doubts the previous dimeric model and gives deeper insight on this protein's physiological roles.

对亚砷酸根复合体ArsA蛋白质分子结构的揭示显示了该蛋白在亚砷酸根存在情况下，在膜上和水溶液中都是环形三聚体，对前人的二聚体模型假说提出了置疑，并为解释它的生理功能提供了重要的结构信息。

In chapter 2 and 3, the ring-opening polymerization of 2, 2-dimethyl-trimethylene carbonate and trimethylene carbonate catalyzed by IMPPL were explored.

生物可降解聚碳酸酯在手术缝合线，骨固定材料和药物控制释放等领域的研究和应用越来越受到重视。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？