Include a field with the current UTC time-stamp in it and check it on the server. If it is too far in the past, or if it is in the future, the form is invalid.
包含一个存储当前UTC时间戳的字段，并在服务端检查它，如果它是太遥远的过去，或者是将来，那么这个form是无效的。
The radiation pattern in the near and far field of each frequency component of the spectrum of current pulse on a transmission line.
传输线线上脉波电流之频谱与分布及其各频率成份之辐射远近场型之差异。
The near and far electromagnetic field are synthesized by summation of the electromagnetic field of short current segments or Hertz dipoles.
以很多小段赫芝偶极之完整电磁场合成一任意线电流之近场与远场电磁场。
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