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OptiStruct的问题
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练习OptiStruct的时候最后出现了这个错误，是什么意思？
*** ERROR # 1501 ***
for material id = 1 referenced from property id = 1.
Either E or G must be explicitly provided for MAT1. Otherwise singular
material is produced.
************************************************************************
*** ERROR # 1501 ***
for material id = 1 referenced from property id = 1.
Either E or G must be explicitly provided for MAT1. Otherwise singular
material is produced.
************************************************************************
00illusion00 
