无管的

A division of nonflowering plants characterized by rhizoids rather than true roots and having little or no organized vascular tissue and showing alternation of generations between gamete-bearing forms and spore-bearing forms; comprises true mosses and liverworts and hornworts.

无花植物的一个亚部，以假根而非真根为特点，有小的或没有维管组织，有结合体和孢子体的世代交替；由苔藓类组成。

Daily supplementation with folic acid for 1 month prior to conception and during pregnancy may reduce the incidence of neural tube defects such as spina bifida and anencephaly in the child.

每天补充叶酸的前1个月的概念，并在怀孕期间可能会减少神经管畸形，如脊柱裂和无脑畸形的儿童。

With the system,one can observe the formation,deformation and breakup of an axisymmetric liquid ring.

这种新的实验设备是由垂直的无膜激波管和液体环发生器所组成，可以用来观察轴对称液体环的形成、变形和破碎过程。

For post core crown, the core materials with high elastic modules are commendated, and if composite resin post core is adopted, it should also have higher elastic modules.

对于行根管治疗术后的无髓牙，进行核桩冠修复时，应采用高弹性模量的桩核材料；如果使用复合树脂核，也应采用高弹性模量的复合树脂。

There was no difference in different types of peripapillary diverticulum and the incidence of pancreaticobiliary disease.

憩室的存在可能和某些胰胆疾病的发生有关，而不同类型乳头旁憩室间胰胆疾病的发生无显著差异，乳头旁憩室在一定情况下并不影响插管成功率。

When heated in the absence of oxygen, keratin forms hollow tubular structures six millionths of a metre across and riddled with microscopic pores, much like carbon nanotubes.

在无氧环境下加热角蛋白（一项称为高温分解的工序），它会形成六百万分之一米宽的空管结构，上面打有微孔，和碳纳米管非常像。

The 2×390MW HRSG in Xiamen Eastern Power Plant for combustion engine works adopts the HRSG manufactured by Hangzhou Boiler Group Co., Ltd., which is characterized by three-pressure, reheats, without after－combustion, horizontal type and natural circulation. Since the full set of HRSG designing technology from the US NOOTER/ERIKSEN has been introduced, it matches with PG9341FA type gas turbine, adopting single-row frame construction, full suspension type, and in-line arrangement in the heating surface. The heat conduction components use gear screw finned tube, module type supply and positive pressure operation.

厦门东部燃气电厂2×390MW燃机工程的余热锅炉采用由杭州锅炉厂生产的三压、再热、无补燃、卧式、自然循环燃机余热锅炉，引进美国NOOTER/ERIKSEN公司全套燃气轮机余热锅炉设计技术，它与PG9341FA型燃气轮机相匹配，采用单排框架结构，全悬吊形式，受热面顺列布置，传热元件采用开齿螺旋鳍片管，模块式供货，锅炉为正压运行。

The method of centrifuge tube culture can be used as a constructing technique of tissue engineered cartilage without scaffold material.

结论在无支架材料条件下，采用离心管培养技术培养的人胚胎关节表面软骨细胞可以构建组织工程化关节软骨，而且接近正常关节软骨的形态和功能。

The method of centrifuge tube culture can be used as a constructing technique of tissue engineered cartilage without scaffold material.Cartilage,articular; Histology; Biomedical engineering; Cell culture

结论在无支架材料条件下，采用离心管培养技术培养的人胚胎关节表面软骨细胞可以构建组织工程化关节软骨，而且接近正常关节软骨的形态和功能。

The part I of the experiment will be used a digital particle image velocimetry system to measure instantaneous and non-invasive ensemble-averaged flow fields inside the glass curtain of the ACC. Particularly for the reduced scale test section of ACC that are used in incinerator, we are used to observe the streamline distributions at the middle plane inside the glass curtain in various inlet velocity of the blowers for the one-row, two-row, three-row ACC and the glass curtain with and without holes.

本研究初期将藉由数位质点显像测速仪定量且非侵入式的量测技术，针对焚化炉用空气冷凝器的缩小维度测试件，在不同入口风速、冷凝管排数、玻璃帷幕有无开口方式下，观测其玻璃帷幕内之流体全域速度场。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐