送交者: pgss 于 2014-12-08, 01:25:59:

回答: there should another rocket behind so that the load is at teh centroid? 由 pgss 于 2014-12-08, 01:13:44:

• from below view - pgss (60 bytes) 2014-12-08, 01:28:06 (764936)

加跟贴