查询词典 stem

This article introduces an easy way of deep machining and puts forward taking use of normal machine tool,simplifying craft installment,improving twist drill and connection types of drill stem by analyzing many influent factors on deep machining,which include discharging scrap,wear and tear,radiating and orientation.

本文介绍了一种简便的深孔加工方法，通过对深孔加工中排屑、磨损、散热和导向等诸多因素的分析，提出了利用普通机床，简易工装，改进麻花钻及钻杆的连接形式，在实践使用中取得了较好的效果。

Grant prideco drilling products.co., ltd tianjin tanggu branch is wholly owned subsidiary of nov grant prideco is the world's leader in drill stem technology and drill pipe manufacturing, a global leader in drill bit technology and manufacturing, and a leading provider of high-performance engineered connections and premium tubular products.

格兰特钻具有限公司北京分公司是国民油井华高所属的一家全美资公司。格兰特公司在钻柱技术和生产以及在钻头技术和生产方面一直处于全球领先地位。同时也是全球最主要的高性能钻杆供应商之一。

The main products are standard twist drill stem Cone, Cone handles longer, long twist drill, various types of machine, hand cutter knife, the special-shaped cutter and the non-standard tool.

主要产品有锥柄标准麻花钻，锥柄加长，特长麻花钻，各类机用，手用绞刀，铣刀以及非标准的异型符合刀具。

Based on the drilling operation of 4 Wells, this article describes the basic characteristic of coalbed methane and technical difficulties in drilling. Some technical keys as borehole quality, fresh Water drilling,fresh water coring, coal-bed methane protection are solved through application of a series of techno1ogical measures such as optimization of rock bit, optimization of drill stem, optimization of drilling parameters and string coring and etc. The experimental performance, especially in fine-grained ...

本文以四口井的施工为例，着重介绍了煤层气井的特点，并指出了钻煤层气井的几个技术难点，通过钻头优选，钻具优选，钻井参数优选，绳索式取心技术等的现场实施和应用，基本解决了井身质量，清水钻井，清水绳索取心，煤层气保护等几个方面的技术难题，文中还介绍了使用中原油田自行设计的中原9508绳索取心工具的取心情况，尤其是在粉煤层地区的取心情况，这将为今后的煤层气开发打下坚实的基础。

We were initially looking for what is driving liver stem cell proliferation during chronic liver injury.

但最初我们的目的是寻找在慢性肝损伤时什么动力推动了肝脏干细胞的增殖。

The recombinant dual human stem cell factor possesses higher specific activity than the monomer form of hSCF and might be preferred since it could be administered at low doses to avoid significant mast cell activation while stimulating hematopoietic recovery.

重组人二连体干细胞因子具有比干细胞因子单体更高的比活，可以避免副反应。

The ancients contain young building lord say for the certificate, young of building lord,such as red beginning of day, rise, big light of its teachings; a 伏 of river flow, one 泻 is boundless; the 潜 dragon 腾渊, the scales and claws float in the sky; nursing tigress roar valley, all kinds of animals earthquake 惶; the duck hawk try the wing, the dust of journey absorb the piece; strange HUA CHU TAI, the 皇皇; the stem will deliver the 硎, have already made its long grass; the day wear its 苍, a 履 it Huang; the 纵 is historic, horizontal have eight 荒s; small living main to the building of admire if surging river water is continuous not extremely, the seas dry up and rocks crumble, the day collapse a ground of 裂, changing the heart never.

古人有少年楼主说为证，少年之楼主如红日初升，其道大光；河出伏流，一泻汪洋；潜龙腾渊，鳞爪飞扬；乳虎啸谷，百兽震惶；鹰隼试翼，风尘吸张；奇花初胎，皇皇；干将发硎，有作其芒；天戴其苍，地履其黄；纵有千古，横有八荒；小生对楼主之仰慕如滔滔江水连绵不绝，海枯石烂，天崩地裂，永不变心。

The results show that these proteins may be related to dwarfing rice stem and provide another pathway for finding the dwarfing gene.

这些差异蛋白很可能与水稻矮化有关，为水稻矮秆基因的寻找提供了另一个有效途径。

Stem loops and short dyad sequences appear in the downstream of the translation stop codon.

序列结构分析发现在编码区的下游有可形成茎环的反向重复序列和形成发夹结构的回文序列。

Gene mutations were detected in 25 patients and a 18-year-old girl among 16 families. Trinucleotide repeats of CAG were 73～79. The fragments of abnormal alleles were 380～402bp, and all patients were heterozygous. The copy numbers of normal alleles were 18～40, fragments from 202～270bp. SCV reduction was much obvious compared to MCV, MCV and SCV in lower limb ?ere much more slow than that in upper's. BAEP, VEP were also delayed in latency. The anticipation in parental sex bias were much more obvioius than that in matental's. Cerebellar ataxia was most severe, the next were dysarthria and bulging eyes. Amytrophy was seen only in bed ridden patients. Cerebellar atrophy was more severe than brain stem, cord atrophy was n't observed in all MJD.

结果检出10个家系25例病人及1例症状前18岁女孩有MJD基因突变，CAG三核苷酸重复73～79次，异常等位基因片段长380～402bp，均为杂合子；正常人CAG三核苷酸重复18～40次，等位片段长200～270bp，电生理发现MJD的SCV减慢比MCV明显，而下肢的MCV、SCV又较上肢明显，BAEP、VEP均有不同程度的潜伏期延长或波的异常；MJD的父亲遗传早于母亲，进展也较块，临床以小脑性共济失调为突出症状，其次为构音障碍、突眼等，肌肉萎缩仅见于晚期病人；MRI示小脑萎缩较明显，脑干萎缩并不严重，未见明显的颈髓萎缩。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。