Gong cheng fei ping heng re dong li xue/ Gong cheng li xue=: Dynamics = dong li xue/ Gong cheng li xue wen ti xiang jie=: Dong li xue/ Gong gong ling yu zhong de lun li xue/ Qi che she ji yu kong qi dong li xue/ Xian dai ying yong dong li xue/ Gong cheng li xue wen ti xiang jie=: Jing li xue/ Gong cheng li xue=: Statics = jing li xue/ gong shang xing zheng guan li Ban dai gang sheng chan gong yi xue/