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ÔÎÄ£º Until 2001 the phenomenon of the negative refraction has been experimentally verified first by using artificial left-handed materials realized by periodic arrays of split ring resonators (SRRs) and wire strips . ±à¼Òâ¼û£º In the 1st paragraph of section 1 ¡°Until 2001 the phenomenon of the negative refraction has been experimentally verified¡± if you mean ¡°until 2001¡± (2001 is the ending point), then ¡°has been¡± has to be changed to ¡°had been¡±. If you mean ¡°since 2001¡± (2001 is the starting point) then there is no problem with ¡°has been¡±. ×÷Õß±¾Ò⣺ֱµ½2001£¬XXX²Å¿ªÊ¼¡£¡£¡£¡£ [ Last edited by xdpeter on 2011-4-1 at 12:17 ] |
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luckygirl5605
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xdpeter(½ð±Ò+4, ·ÒëEPI+1): ¶àл£¬µÚÒ»¸ö»ØÌû£¬¶à·Öµã£¬ºÇºÇ 2011-04-01 13:19:58
Å×שÒýÓñºÙºÙ![]() The phenomenon of the negative refraction has not been experimentally verified until 2001, first by using artificial left-handed materials realized by periodic arrays of split ring resonators (SRRs) and wire strips . |
2Â¥2011-04-01 12:43:21
qjluo
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3Â¥2011-04-01 12:45:52
qjluo
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- ½ð±Ò: 926.1
- Ìû×Ó: 235
- ÔÚÏß: 127.3Сʱ
- ³æºÅ: 405887
4Â¥2011-04-01 12:50:00














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