无实用价值的

The variable speed drives has good structure and properties, and it can use as batch production.

这种无级变速器有良好的结构和性能优势，具有很强的实用价值，完全可以作为批量生产的无级变速器。

This thesis gives the introduction of the construction technique of a Slab Non-ballast Track, which has been used in the Shuanghe Bridge of Qin-shen Passenger Railway, and sheds light on a series of key construction techniques, mainly including: fabrication of the trackslab, research and production of CA sand mortar, construction of concrete bearing and convex retaining wall, paving of track slab, pouring of CA mortar mixture, construction of the filled cushion slab etc. All these will have the significant reference and application value for its employment to the construction of the city overhead to rack and the express railway.

论文介绍并总结了在秦沈客运专线双何特大桥采用的无碴轨道的一系列关键施工技术，主要包括轨道板的制造工艺、CA砂浆的研究及配制、混凝土底座及凸形挡台施工、轨道板铺设、CA砂浆灌注、充填式垫板的施工等技术，对城市高架轻轨、高速铁路桥梁等工程，此项新技术的推广具有重要参考价值和实用价值。

It lead to a new way for scatheless measure of AT,and we get further reliazing the applying values and phisiological meanings of AT itself.

这不仅为无氧阈无损测量指出新的途径，也使氧脉搏本身生理意义和实用价值的得到进一步的"挖掘"。

The article introduces several methods of how to turn string without metering line during tunneling .

介绍了无测量线点时，巷道掘进如何拐弦的几种方法，使用该拐弦时可以把抽象的思维变为简单的距离与角度的测量，该方法操作简便实用，很适于无测量线时的应急，具有较强的实用价值。

objective to evaluate the role of mr perfusion weighted imaging in preoperation diagnosis of meningiomas.methods mr perfusion weighted images was performed in 47 patients with meningiomas followed by conventional imaging.results the mean rcbv values of angioblastic was the highest in the parenchyma of tumor.the mean rcbv values of malignant group was the lowest.the biggest mean rcbv values among different type meningiomas was statistically significant.the biggest mean rcbv values between benign and malignant group meningiomas was statistically significant,but not in the peri-tumor edema.conclusion the rcbv values were useful in the preoperative differentiation diagnosis of different types of meningiomas.those in the peri-tumor edema were useless in the preoperative differentiation diagnosis of different types of meningiomas.

目的 探讨磁共振灌注成像技术对脑膜瘤术前分型及良恶性鉴别的临床应用价值。方法对47例脑膜瘤病人行mr灌注成像检查，对5种亚型的良性脑膜瘤的mr灌注成像进行分析，并与非典型性及恶性脑膜瘤进行比较。结果血管瘤型脑膜瘤实质部分的rcbv值均数最高，恶性组脑膜瘤的rcbv值均数最低。各亚型间瘤体实质最大rcbv值均数间差异有统计学意义(p＜0.05)，良恶性脑膜瘤实质部分最大rcbv值均数间差异有统计学意义(p＜0.05)。瘤周水肿区的rcbv值均数间差异无统计学意义(p＞0.05)。结论 rcbv值对脑膜瘤术前分型及良恶性鉴别有所帮助，而瘤周水肿区的rcbv值对脑膜瘤分型及良恶性鉴别未显示临床实用价值。

Nowadays, the research on low speed and high-torque permanent magnetic synchronous machine which using in gearless elevator are getting more and more attention in the fields of motors, and has great science significance and application value.

无齿轮电梯用低速大转矩永磁同步电动机是目前电机领域的研究热点之一，其研究具有重要的科学意义和实用价值。

Hence, theoretically analyses on the transmission characteristics of digital jointless track circuit and design software are of great theoretical and practical value.

因此，对数字无绝缘轨道电路进行传输特性分析研究具有重要的理论意义和实用价值。

The indirect sign includes the stercolith in the appendix with sound shadow; periappendicular absence echo or deposit echo when appendicitis complicated with exudation or perforation; mixed swollen echo on the right hypogastric region when abscess formated; dilation of intestine; local ileocecal edema or mesenteric thickening and encysted greater omentum.

间接征象：阑尾内粪石并声影；阑尾炎有渗出或穿孔时周围的无回声区或有沉积物回声；脓肿形成时为右下腹混合性肿块回声；肠管扩张；回盲部肠管局限性水肿或肠系膜增厚和大网膜包裹。B超检查简便、可重复性对阑尾炎诊断有很大的实用价值，应列为首选的影像检查方法。

Conclusions］Complex acetabular fractures with displacement should be evaluated by means of 2D rconstruction and three-dimensional multislice spiral CT.However 3D CT is of little practical value in undisplaced acetabular fractures.

结论］对于有移位的髋臼骨折尤其是复杂的骨折，应尽可能行二维及三维CT重建协助完善术前准备，三维CT对无移位的髋臼骨折实用价值不大。

It further proves the distinct element method simulation model of charging of bell-less top blast furnace is true, and indicates this mathematics model not only has great theory research significance, but also have full practical worth. The distinct element method simulation model of charging of bell-less top blast furnace is a computer model.

本文还对实际无钟炉顶高炉开炉布料进行了离散单元法模拟研究，模拟结果与实测结果也基本符合，这进一步证明了高炉无钟炉顶布料离散单元法模拟模型的正确性，并且表明此数学模型不仅具有理论研究意义，而且具有实用价值。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。