将igs文件导入LT出现以下问题: +ib72j%A
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*** Error (AITX_BLANKED_ENTS) *** r?d601(fa
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The input file did not contain any supported non blanked independant entities. "2(4?P
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Please check the documentation for a list of supported entities. ciI;U/V
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请教各位是什么原因,如何解决?