杆组法
assur groups
assur group method
rod grouping method
links group method
link group method
Rod-group Analysis Theory
高级杆组
advanced bar group
senior bar group
higher class Assur groups
类Ⅱ级杆组
similar Class Ⅱ bar groups
RRR-RRPⅡ级杆组
RRR-RRP Ⅱ degree bar-group
杆组逼近法
Method of har - group approach