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Researched influence of frequency on characteristic of electromagnetic wave transmission in tunnels, and analyzed characteristic of electromagnetic wave transmission in circular, arches and curved tunnels by method of metal wave guide, and gives approximate formulas of attenuation rate. Main conclusions we obtain are as follows: in circular,rches tunnels, if frequency is higher, attenuation rate is smaller, it is beneficial for EM waves to transmit, in curved tunnel, higher frequency, more attenuation rate ...

研究了频率对井下电磁波传输特性的影响，采用金属波导法分析了圆形、拱形及弯曲隧道中电磁波的传输特性并给出衰减率近似公式，得出主要结论：在圆形和拱形隧道中，频率越高，衰减率越小，越有利于电磁波的传播；在弯曲隧道中，频率越高，衰减率越大，不利于电磁波的传播；通过特性曲线与井下实验数据相比较得出在900MHz左右为井下无线通信系统传输信号最佳频段。

The key of circulation economy lawmaking lies in perfect and development the system arrangement of circulation economy, mainly should include programming system of circulation economy, the evaluation index sign system and investigate the system of circulation economy, standard, marking, symbolize and the attestation system of circulation economy, regard manufacturer as principle of the responsibility extension system, the point enterprise resources economy and make use of circularly certainly the sum management system, the norm system and guide system of the industry policy, the incentive system and responsibility system of government, enterprise and the publics.

循环经济立法的关键在于完善发展循环经济的制度安排，主要应该包括循环经济规划制度，循环经济评价指标体系和考核制度，循环经济的标准、标识、标志和认证制度，以生产者为主的责任延伸制度，重点企业资源节约和循环利用的定额管理制度，产业政策的规范和引导制度，政策激励制度以及政府、企业和公众的责任制度等。

As for his wife, Dakmema, her compassion for Mila was humanly noble and circumstantially necessary and she was indeed his friend, mother and spiritual guide.

玛尔巴的妻子达米玛对米拉热巴的怜悯表现出她高尚的人格，在当时的情况下很有必要。她的确是米拉热巴的朋友、母亲和精神导师。

In some cases, the cause of the unreasonable value was related to some aspect of the procedure, such as inadequate SSG contact on the sand bedding or an uneven surface that would cause the CIST drop weight to rebound laterally against the inside of the guide tube upon impact; however, particularly with the SSG, the cause of the unreasonable measurements was often unknown and simply required repeat testing.

在某些情况下，造成这一不合理的价值，是与某些方面的程序，如不足特殊保障联系上的砂垫层或不平坦的表面，会引起中科院落锤，以反弹横向对里面的引导管后的影响，但是，尤其是同特殊保障，造成这一不合理的测量往往是未知的和根本要求重复测试。

But if the history of mergers is any guide, the smart thing for Citicorp shareholders to do may be to sell immediately, or shortly after the Travelers deal is completed.

但如果历史的兼并是任何指导，聪明的事，花旗集团的股东这样做可能会立即出售，或后不久，旅客处理完成。

I HAVE 2 YEARS EXPERIENCE AS AN ENGLISH TOUR GUIDE IN BEJING. I WORKED FOR CYTS AND CITS.

我有两年北京英文导游工作经验，给中青旅和国旅一些部门带过团。

Group booking from CITS, from Dec12-15,12 peoples, 1 tour guide.

中国国际旅行社的团队12月12-15日，12人，1全陪。

I felt my heart almost jumped out of my mouth when one day I heard that CITS, China International Travel Service, was recruiting English Guide Interpreters.

有一天，当我听说中国国际旅行社正在招聘英语导游翻译时，我的心激动得要跳了出来。

We need a guide who knows the city better than this man .

我们需要一个比这人更了解这个城市的向导。

City operation and management should guide the process of city's planning and construction.

城市经营和城市管理应同时统领着城市的规划和建设过程。

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。