Irin alagbara, irin square tube

lilo pupọ ni ẹrọ, ohun elo iṣoogun, ohun elo amọdaju, Qizheng, awọn ọkọ oju-irin iyara giga, awọn ọkọ ayọkẹlẹ, aga, ọṣọ ati awọn idi miiran.