将igs文件导入LT出现以下问题: [I:KpAd/
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*** Error (AITX_BLANKED_ENTS) *** }P3tn
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The input file did not contain any supported non blanked independant entities. dDDGM:]
{u[V{XIUh
Please check the documentation for a list of supported entities. \*\R1_+
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请教各位是什么原因,如何解决?