Precast Choj Beam Thiab Kem Pwm

Pob Tawb: Taw qhia Choj piers yog cov kev txhawb nqa ntawm cov txuas hniav thiab yog hom kev sib txuas ua ke ntau tshaj plaws, feem ntau yog tsim los ntawm pier lub cev formwork thiab pier cap