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目前国内生产
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  current status of the domestic production
     The current status of the domestic production of 1 kV class 5 core power cables is outlined and the foreign manufacturing equipment and process are presented. Finally, an economic analysis is made on the application of copper, aluminium and steel as the protective sheath of 1 kV class 5 core power cable.
     综述目前国内生产 1k V五芯电力电缆的概况 ,介绍了国外的生产设备和工艺 ,并对铜、铝、钢三种材料作为 1k V五芯电力电缆的保护层作了经济分析
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  “目前国内生产”译为未确定词的双语例句
     Based on study of GB 18242-2000 and GB 18243-2000, this paper introduces the standard calculation method for amount of filling material added, which is conformable with the production status in China.
     通过对卷材标准GB18242—2000和GB18243—2000的研究,找到了一种填充料填加量的计算方法——标准计算法,计算得出的卷材填充料填加比例符合目前国内生产实际状况。
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     At present, the method of producing purity aluminum in China is also three-layer aluminum electrolysis, which needs consuming about 19000Kwh D.
     目前国内生产精铝采用的主要方法仍是三层液铝电解精炼法,但与国外相比,我国的三层液铝电解精炼生产吨铝直流电耗高达19000KWh左右,高能耗严重阻碍了我国三层液铝电解精炼的发展,在很大程度上制约着国内精铝的生产。
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     Owing to the rapidly increased domestic demand of electric energy,the domestic production ca-pacity of the large-sized,heavy-wall seamless steel tubes is far from satisfaction to the current market demand,and this situation has led to import of most of the tubes of such kind ranging from Ф159 mm to Ф1 066 mm.
     随着国内电力需求的迅猛增长,目前国内生产的大口径厚壁无缝钢管远不能满足市场需求,致使Φ159~1 066 mm规格范围的该类管大部分需进口。
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     domestic scientific research, industry production and its application; its result of the application in Three Gorge Project; and some principles of choosing chemical grouting materials for considering environmental protect.
     对建筑防水材料的重要成员之一——化学灌浆材料作了扼要介绍,包括其特点、分类及用途,目前国内生产、科研及应用概况,在三峡工程中的应用成果,以及考虑到环境保护而提出的选用化灌浆材的原则。
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     At present, the method of producing β-metho-naphthalene in china is refrigerating rime techniques, but the highest pure degree of the production is 95% and recuperate is only 40% or so.
     目前,国内生产β–甲基萘,主要是通过冷冻结晶的方法,产品纯度最高为95%,收率为40%左右。
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     domestic scientific research , industry production and its application ;
     目前国内生产、科研及应用概况;
     C.
     本文介绍了目前国内尚未生产的C. I.
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     At present, most of the national factories produce hard low-E films.
     目前,国内生产低辐射薄膜大多数在线膜。
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     X.
     目前X.
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     But none of Chinese Corporations can manufacture the sensor alone.
     但是,其芯片目前国内尚无厂家可以生产
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The air track is a multi-purpose laboratory equipment for mechanics experiments. The orifice diameters of various types of home made air tracks are different from each other, and there is no special purpose air supply. This makes it difficult for wider application and improvement of experimetal precision.In this paper, four types of air supplies and six air tracks with different orifice diameters were tested. The measuring principle and method for testing the combination of the air supplies with the air tracks...

The air track is a multi-purpose laboratory equipment for mechanics experiments. The orifice diameters of various types of home made air tracks are different from each other, and there is no special purpose air supply. This makes it difficult for wider application and improvement of experimetal precision.In this paper, four types of air supplies and six air tracks with different orifice diameters were tested. The measuring principle and method for testing the combination of the air supplies with the air tracks were proposed. The relations among air supplies, orifice diameters and the glider masses were investigated. From the experimental results it follows that to obtain the most suitable thickness of the air cushion, while the glider on the air track being in the best state of motion,the air supplies of appropriate parameters should be selected to fit the air track with different orifice diameters.

气垫导轨是一种多用途的力学实验设备。目前国内生产的各种型号气轨的排气孔径极不相同,又尚无专用气源配套,这给气轨的广泛应用和提高实验的精度都带来了不少困难。 本文从实验角度选用四种气源和六台不同排气孔径的气轨分别进行了测试,提出了检验气轨与气源配套的测试原理和方法,对气源和气轨排气孔径以及滑块质量之间的关系作了初步探讨。实验结果表明:要得到滑块在气轨上最佳运动所需要的气垫层的厚度,不同排气孔径的气轨应配用不同参量的气源装置。

Ten kinds of vegetables were qerved as experimental materials and the ultra-thin plastic films were used as mulching materisls. The films are in three colours: Colourless transparent, green and black. They were covered on the soil surface arounding the plants of vegetables. In order to compare the effects of various films on growth, develop- ment and yields of vegetables. The results of test showed that three mulch ing malerials possess a significant effect in increasing soit temperature during the low temperature...

Ten kinds of vegetables were qerved as experimental materials and the ultra-thin plastic films were used as mulching materisls. The films are in three colours: Colourless transparent, green and black. They were covered on the soil surface arounding the plants of vegetables. In order to compare the effects of various films on growth, develop- ment and yields of vegetables. The results of test showed that three mulch ing malerials possess a significant effect in increasing soit temperature during the low temperature scasons. They can highten temperature of soil which covered with films about 3 to 5℃. As for the effeet of increasing temperature. The colourless transparent film is the best; the green is medium and the black is poor. All of these films have better effeets in preseruing water. Yet, the black and green films have a better effeet of controlling weeds. Film mulchings promoled the growth and deuelopment of both top Parts and roots of the vegetables and Strengthened the resisance to diseases and also increased the content of chlorophyll. Because of these reasons mentioned above, the yields of vegetables under mulehing condition can be increased about 1 to 1.5 fold in earlier period of the growing Season, the tolal production can be increased more than 30%, when compared with the nonmulching. However, the qua lity of fruits have no noticeable change.

作者利用无色透明、绿色和黑色三种极薄的塑料薄膜给各种蔬菜进行地面覆盖。结果证明在低温季节里三种地膜均有明显的提高地温效果和保水效果。有色地膜还有很好的除草效果。三种地膜均能促进蔬菜地上部和根系的生长发育,显著增产,尤以前期增产更为突出。蔬菜塑料薄膜地面覆盖在我国研究、示范和推广已有三年的历史。主要是采用无色透明地膜进行地面覆盖,对透明地膜研究的比较多。我们在1980年的试验结果也充分证明了透明地膜的性能和覆盖蔬菜的增产效果。但是对目前国内生产的一些有色地膜却研究极少,为了解有色地膜的性能和覆盖效应,找出适合蔬菜地面覆盖的地膜种类,扩大地膜在蔬菜上的应用,我们于1981年和1982年在本校标本园进行了无色透明膜、绿膜和黑膜三种地膜覆盖蔬菜的试验。 1981年对三种地膜的增温、保水、保肥、除草等性能进行了观测,并对促进地上部和地下部生长发育以及增产效果进行了调查记载。1982年对三种地膜覆盖后,蔬菜的肯绿素含量、光合同化量、气孔状况、抗病性能、果实品质以及产量进行了观测。以便叶定增产效果,力争找出增产机理。

Ultrasonic thickness gages are widly used in industry.The gages made in home,however,are working in contact way,therefore can't be used to monitor the thickness of on line products.In this paper,the method how to convert the contact—type ultrasonic thi-ckness gage into nonconatct—type is discussed.

脉冲间隔法超声波测厚仪已经广泛应用于工业生产中。由于这种方法简单可靠、精度高,越来越显示出它的优越性。但是目前国内生产的超声波测厚仪都是接触式的。只能用于接触式静态测量,而不能用于连续自动测量系统中,局限性很大。本文讨论了把接触式超声波测厚仪改装成非接触式,以用于薄板材生产过程动态测量中的问题。

 
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