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tag_t tWrkPrt = UF_ASSEM_ask_work_part();
tag_t tRootOcc = UF_ASSEM_ask_root_part_occ(tWrkPrt);
tag_t* tChildren;
int nCmpNum = UF_ASSEM_ask_part_occ_children(tRootOcc, &tChildren);
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原文：http://www.cnblogs.com/esdtech/p/4445076.html
