验证电磁场影像及场型特性在近场与远场中之差异。
Verification of differences of characteristics of electromagnetic field image and radiation pattern in the near and far field are demonstrated.
结果在前磨牙区，分角投照、平行投照根尖片影像长度和牙齿实际长度之间无显著性差异。
Results The actual teeth lengths shew no significantly different from the teeth length on periapical films of bisecting angle technique and of distant paralleling technique.
由于TM卫星影像分辨率的限制，很难分别出林分垂直结构的差异。
Due to the resolution limit of TM imagery, it is difficult to distinguish the forest variety in vertical structure.
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