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  1. ... in size) Insect net-->marbles--> Pantyhose-->metal mesh-->sand-->gravel-->coffee paper What you have to do is use the...

    分類:科學及數學 > 化學 2008年06月26日

  2. ...in your answer. It is not due to diffraction effect. The metal mesh attenuates the electric field components of the microwave because of...

  3. ...3000 years ago primitive gears first meshed with each other and transmitted rotary motion. .... The early Greeks made use of metal gears with wedge ...

    分類:科學及數學 > 工程學 2008年05月05日

  4. ... sometimes constructed of a conductive wire mesh whose openings are smaller... have a problem because these rays go through most metals and glasses. ...