将igs文件导入LT出现以下问题: ^{-J Y
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*** Error (AITX_BLANKED_ENTS) *** A"#Gg7]tl'
n'1pNL:
The input file did not contain any supported non blanked independant entities. o{?s\)aBa
UbJ_'>hK 6
Please check the documentation for a list of supported entities. G*mk 19Z
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请教各位是什么原因,如何解决?