Tsis ntev los no, Towards tau yeej ib lub tsev kho mob elevator project uas muaj cov kev xav tau siab heev. Hnyav load, fireproof qhov rooj, thiab elevator ntse pab pawg tswj yog qhov tseem ceeb thov. Sib txawv ntawm cov neeg nrog caij elevator, tsev kho mob of elevator muaj qee qhov kev tsim tshwj xeeb, xws li el ...
Nyeem ntxiv